PT 35 S4 Q20

   Archaeologist: A skeleton of a North American mastodon ... ...

Which one of the following, if true, most seriously weakens the archaeologist's argument?
(A) The projectile found in the mastodon does not resemble any that were used in Eurasia before or during the Ice Age.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Weaker: Intro Set