GMAT Sentence Correction (SC) | Re: Written in Austria in 1762, the composer of Symphony

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.
A) the composer of Symphony No. 5 was a brilliant musician, Franz Joseph Haydn, who many later called the "Father of the Symphony" for his
B) Franz Joseph Haydn's Symphony No. 5, who many later called the "Father of the Symphony"