The modern jazz quartet is known for
a. combining jazz with the baroque style of j. s. bach.
b. combining jazz with the baroque style of j. s. back and performing in concert halls wearing tuxedos.
c. the innovative use of electric guitar.
d. performing in concert halls wearing tuxedos.

The correct answer would be option A) Combining jazz with the Baroque style of J.S. Bach.

Explanation:

The Modern Jazz Quartet was a jazz band born In 1952 that played music influenced by blues, classical, bebop and cool jazz styles.

With the proper techniques, they managed to perform sophisticated counterpoint melodies inspired by baroque music, maintaining the blues feeling.

In 1973 they released an album named Blues on Bach, which contains four original Blues of their repertoire mixed up with five adaptations of from classical works composed by Bach.

I hope it helps!