Final answer:
In Jewish religious services, the singing leader is known as a Cantor, which is different from a conductor, maestro, or soloist. Option A is correct.
Step-by-step explanation:
The singing leader in Jewish religious services is called a Cantor. The cantor, or chazzan in Hebrew, plays a pivotal role in synagogue services by leading the congregation in prayer and song.
This position is distinct from a conductor, who leads an orchestra, a maestro, which is a term used to reference a distinguished musician, and a soloist, who is a person that performs a solo.