Since 1929, cosmologists have known that the universe is expanding. βββββ βββββββββ ββββ βββββββ ββββ βββ βββββββββ ββ βββββββ ββ βββ ββββββββββ βββ βββββββ ββββ βββββββ βββ ββ βββ ββββ ββββββ βββββββββββ βββ βββ ββ βββββββ βββ βββββββ ββ βββββββββ βββ βββββββββ ββ βββββββββ βββββ βββββ ββ βββββββββββ ββ βββββ βββββββββ βββ ββββββββ ββββββββββ ββββ ββββ ββββ βββββββ ββββ βββββββββ βββββ ββββββββ βββββ ββββ βββ βββββββββ ββ βββ ββββββββ ββ ββββββββ βββββββββββββ
ββββββββββββ ββββ ββββββββ βββ ββββββββββββ βββ βββ βββββββββββ βββββββββ ββ βββ βββββββββ ββββ βββ β βββββββββ ββ βββ βββββββ ββββββββββ ββ βββ βββββββββ βββ
ββββ ββββββββββββ βββββββββ ββββ βββ ββββ ββββββ ββββ ββββββ βββ βββββββββββ βββββββββ ββ βββ ββββββββ ββ βββββββ ββ β βββββ ββ βββββββββ ββββββββββ ββββββββ ββββββββββ ββββ βββββ βββ ββββ βββββββ βββββ ββββββ ββ βββββββ ββββββββββ βββ βββββββββ ββββββββ βββββ ββββ βββββββ βββββββββ βββββββββ βββββββ ββ βββ βββ ββ ββββββββββ β βββββββ ββββ βββββββββ β ββββββββ ββββββ βββββββ βββββββββ ββ βββ ββββ ββββββ ββββββββββ ββββ ββββββ ββββββ βββββββββββ βββ ββββ ββββββ ββ βββββ βββββ ββββββ ββββββββ βββ
ββββ βββββββββββ ββ βββ ββ βββββ βββ βββ ββββββ βββββββ ββ ββ ββββ βββ ββββββ βββ βββββββ ββ ββββ ββββββ ββ ββββ ββββββββ ββ ββββββββ βββ βββββββββββ βββββββββ ββ βββ ββββββββ ββ ββββββββ ββββ ββββββ ββββ βββββ ββββββββββββββββββββ ββ βββββββββββββββββββββ ββ ββββββ βββββ ββ ββββββββββ βββββββ ββββββ ββ ββββββββββ βββββββββ βββ
Which one of the following βββββββββ β ββββββ βββββ ββββββ ββ ββββ βββββββββ ββ ββββ ββ βββ ββββββ βββββββββ ββ βββ ββββββ ββββββββββ
A historian proposes β ββββββββ βββ ββββββ ββ βββ ββββββ ββ ββββ βββ ββ ββββββ ββ βββββββββ ββ ββββββββββββ ββ βββββββββ βββ βββββββββββ ββ βββ ββββββββββ ββββ
We don't know whether the theory described in (A) requires a radical change in our understanding of a different theory.
A theory in βββββββββ βββββββ ββββ βββ βββββ ββββ βββ ββββββ βββ βββββββββββ βββββββββββββββ βββ ββββββββ ββββββββββ ββ ββββ βββββ ββ βββββββββ ββ βββββββ ββββββββββββββ
We don't know whether the theory described in (B) requires a radical change in our understanding of a different theory.
A bizarre astronomical ββββ ββ ββββββββββ ββ βββ βββββ βββββββ βββ βββ βββββββββ ββ βββββ ββ ββ ββββββββββ ββββ βββ βββββββββ ββββββββ ββββββ βββββββββ βββ βββββββββββ ββ βββ βββββ βββββββ
We don't know whether the theory described in (C) requires a radical change in our understanding of a different theory.
A current nutritional ββββββ ββββββββββ βββββββ βββββ ββ ββββββββββ βββ β βββ ββββββββββββ ββββββ βββββ ββββββ ββββ βββββ βββββ βββ ββ ββββ βββββββ
We don't know whether the theory described in (D) requires a radical change in our understanding of a different theory.
A new theory ββ βββββββ ββββββββ βββββββ βββββββββββββ ββ βββ ββββββ ββ ββββββββββ βββ ββ βββ ββ βββββββββ ββ ββββββββββββ ββ βββββββββ ββββββββββ ββββββββββ ββββββββββ
This is the only answer describing a theory that requires a radical change ("drastic modifications") in our understanding of a different theory. (E)'s reference to the ability to confirm/disconfirm by examining currently observable biological phenomena is analogous to the way in which the theory in paragraph 4
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