The correct answer is C. Flatterer.
A sycophant is a person who flatters someone in order to gain favor or advantage. A flatterer is someone who praises someone excessively, often insincerely, in order to please them. A suppliant is a person who begs or pleads for something. A follower is a person who supports or follows someone or something. An admirer is a person who likes or respects someone or something.
A sycophant is different from a suppliant in that a sycophant does not necessarily need something from the person they are flattering, while a suppliant is asking for something. A sycophant is also different from a follower in that a sycophant is not necessarily interested in the person they are flattering, while a follower is interested in the person they are following. A sycophant is also different from an admirer in that a sycophant is not necessarily sincere in their flattery, while an admirer is sincere in their admiration.