Linguist: You philosophers say that we linguists do not have a deep understanding ... ...

Linguist: You philosophers say that we linguists do not have a deep understanding of language, but you have provided no evidence. Philosopher: Well, you have said that you believe that “Joan and Ivan are siblings” is identical in meaning to “Ivan and Joan are siblings.” But this cannot be the case, for the sentences are physically different; yet for two things to be identical, they must have all the same attributes. Of the following, which one is the strongest logical counter that the linguist can make to the philosopher?
(A) Two things can have a few minor differences and still be identical.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2013 LSAT (PT69): Logical Reasoning B