Read the sentence to find out whether there is any grammatical error/mistake in it. Errors, if any, will be in TWO PHRASES of the sentence. The combination of those parts is the answer of that question. If no part in the sentence has an error then, mark 'No error' as your answer (ignore punctuation error if any).

In the core of what (A)/ a museum offers is a (B)/ physical intuition with (C)/ its collections (D).