The sentence that best supports the idea that Odysseus did not immediately recognize Achilles when he arrived in Scyros is:
C. Faced with the task of determining which of the “females” he encountered in the royal palace was actually Achilles in disguise, Odysseus presented a set of weapons to the group.
This sentence indicates that Odysseus needed to identify which of the "females" was actually Achilles, suggesting that he did not recognize him at first.