Bach was recognized as the most eminent of his day. a. organistb. composerc. violinistd. cellist

A. organist

Explanation:

He learned to play the organ through the teachings of a cousin of his father.  He quickly developed a huge interest for it, and became a very famous organist in many churches in his native country, Germany.

He held the position of organist in many churches throughout his career.  He loved the religious music and that influenced his compositions.

Bach is considered one of the last great baroque composers.