John had been married two times before he met Jane, who would become h

John had been married two times before he met Jane, who would become his third wife.

A.two times before he met Jane, who would become his third wife
B.two times before he met Jane, who would later become his third wife
C.twice before he met Jane, who would later become his third wife
D.two times before he met Jane, who would become wife number three
E.twice before he met Jane, who would become his third wife

Could anyone generally explain when we use past perfect? What is the difference in this case, would the question still be right in the past simple format: "John was married..."?
The answer itself is clear to me. Thanks.