A preposition is usually followed by a "noun".
A
Correct answer
Explanation
A preposition is a word that shows relationships between other words in a sentence, and it is indeed followed by a noun or noun phrase (which includes pronouns). Examples: 'in THE HOUSE', 'on THE TABLE', 'to HIM', 'with MY FRIEND'. This is a fundamental rule of English grammar - prepositions connect to objects that are noun phrases.