Acapella choral music is meant to be
a. sung without instrumental accompaniment.
b. played in church on an organ.
c. sung by men and boys only.
d. sung by women and girls only.

The answer is letter A.

To sing in an A Capella choral music, singers do not require the use of instruments. Their voices that are well synchronized and organized to play and mimic the tune of the music is enough to deliver their performances. A Capella groups require coordination and teamwork in order to find the right melody of the songs that they are performing. This requires much work and practice compared to making melodies using instruments.

Lutheran chorale is the answer