GmatKiss wrote:Written in Austria in 1762, the composer of Symphony No. 5 was a brilliant musician, Franz Joseph Haydn, who many later called the "Father of the Symphony" for his contribution to classical music while court musician for the Esterhazy family.

C) Symphony No. 5 was composed by a brilliant musician, Franz Joseph Haydn, who many later called the "Father of the Symphony" for his
D) Symphony No. 5 was composed by a brilliant musician, Franz Joseph Haydn, whom many later called the "Father of the Symphony" for his

Whom is used for objective case & who for subjective........

when action is being performed on someone we use objective whom

For example: in the above sentence, many later are performing the action of calling Franz Joseph Haydn "Father of the Symphony"

when action is being performed by someone we use subjective who

For example: who did this???

OA after some discussion