What I put; A irrelevance to argument.

Wrong bc.

The conclusion itself is that selfishness is true of all time periods. This is the argument, it is not irrelevant to the argument. It is just argued poorly.

The correct anser is E.

The argument uses selfishness in two ways.

At first, characterizes selfishness as individualism.

Them, says that acts on behalf of the human species are selfish.

Acting on behalf of the human species may be selfish, but it is not individualistic.

The argument that all periods, not just the 80s, can be characterized by selfish individualism, is not advanced by saying acts on behaf of humankind r selfish