The correct answer is B. proper noun. Proper nouns are names of people, places, institutions, nations, countries, etc. If it has a name, it is a proper noun. So, the White House is the name of a building where the American president lives and works, so it is the official name of an institution, which is why it is a proper noun. Common nouns are words such as chair, desk, window, etc. Compound nouns are two or more nouns connected by the word and (Mary and John). Collective nouns refer to groups, such as team, police, etc.
