Not sure if I get this right but here is how I see it. All elements of the set A belong to B. No elements of the set B belong to C. Hence No elements of A are in C seems correct to me. Answer A seems right. All elements of C belong to A contradicts the second statement. Answer B seems false. Some elements of B are A seems right to me as the first statement says that all elements of A are in B. I am not a native English speaker but I understand the last statement as the set C does not exist, which seems false fo me given the second statement.
Not sure if I get this right but here is how I see it.
All elements of the set A belong to B. No elements of the set B belong to C.
Hence No elements of A are in C seems correct to me. Answer A seems right.
All elements of C belong to A contradicts the second statement. Answer B seems false.
Some elements of B are A seems right to me as the first statement says that all elements of A are in B.
I am not a native English speaker but I understand the last statement as the set C does not exist, which seems false fo me given the second statement.
My answer is A is necessarily true.