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Photographs show an area of Europa, a moon of Jupiter, where the icy surface appears to have buckled as a result of turbulent water moving underneath. This photographic evidence indicates that there is a warm sea beneath Europa's icy surface. The presence of such a sea is thought by scientists to be a primary factor in the early development of life, so there is reason to believe that there may be life on Europa.
17.
The claim that there is a warm sea beneath Europa's icy surface figures in the argument in which one of the following ways?
a
It is a subsidiary conclusion used by the argument to support its overall conclusion.
b
It is the overall conclusion of the argument.
c
It is used to discredit a theory that the argument disputes.
d
It is the only consideration presented in support of the argument's overall conclusion.
e
It is presented as support for a subsidiary conclusion drawn in the argument.