Those that say C is ambiguous and then claim A, B, D, and E can easily be eliminated are technically incorrect if you use your own line of thinking.
Only B and E can be outright eliminated because they are completely false.
A and D (assuming coat and jacket can be interchanged) can be considered ambiguous as well since those can be other traits of the jacket they want just not stated.
So if you are using the ambiguity argument for C, you have to use it for A and D.
But if you were able to eliminate A and D, then you should know that C is the best answer. But you can't eliminate A and D and then only say C is ambiguous because then your logical thinking is inconsistent.