The correct option is C the
Option C: We use 'the' before proper nouns like 'British Museum', when the noun is a unique thing. There is only one museum in the world with the name 'British Museum'.
Other nouns, like 'The Statue of Liberty', 'The Taj Mahal', 'The White House' all use the article 'the'.
Hence option C is correct.
For the same reason, option D 'no article' is incorrect, because proper nouns like these use the definite article 'the'.
Options A and B: 'A' and 'an' are both indefinite articles that modify nouns which are general and non-specific. The identity of that noun is not known. Since the noun here is specific, A and B are incorrect.