Critical Reasoning

Although the earliest surviving Greek inscriptions written in an alphabet date from the
eighth century B.C., a strong case can be made that the Greeks actually adopted alphabetic
writing at least two centuries earlier. Significantly, the text of these earliest surviving
Greek inscriptions sometimes runs from right to left and sometimes from left to
right. Now, the Greeks learned alphabetic writing from the Phoenicians, and in the process
they would surely have adopted whatever convention the Phoenicians were then
using with respect to the direction of writing. Originally, Phoenicians writing ran in either
direction, but by the eighth century B.C. it had been consistently written from right to left for
about two centuries. In the argument given, the two portions in boldface play which
of the following roles?
A. The first provides evidence in support of the position that the argument seeks to establish; the
second is that position.
B. The first provides evidence in support of the position that the argument seeks to establish; the
second presents an assumption on which that argument relies.
C. The first is an assumption that the argument concludes is unjustified; the second presents part
of the grounds for that conclusion.
D. The first is evidence that forms the basis for an objection to the position that the argument
seeks to establish; the second is that position.
E. The first is evidence that forms the basis for an objection to the position that the argument
seeks to establish; the second is a judgment that is introduced in order to call into question
the relevance of that evidence.


As per my knowledge assumption are unstated premises in any argument. So going by this can we readily knock options B & C out??