The first two albums released by the Isley Brothers, an African-American musical group, pictured white people on their covers, because record executives assumed that white consumers would not purchase albums with pictures of African-American artists on them.
The first two albums released by the Isley Brothers, an African-American musical group, pictured white people on their covers
--> correct placement of modifier.
The Isley Brothers’
first two albums, an African-American musical group, pictured white people on their covers
--> modifier placed incorrectly; modifies two albums.
An African-American musical group, the first two albums released by the Isley Brothers pictured white people on their covers
--> nonsense sentence; meaningless
The first two albums released by the Isley Brothers, an African-American
musical group who pictured white people on their covers
--> okay it was the albums that pictured not the grp itself
The first two albums released by African-American musical group the Isley Brothers were picturing white people on their covers
--> wrong tense+wrong construction "comma" is required for some sense to make out of the sentence.
Hence A
HTH