Sentence Correction - Verbal and Reasoning

Directions to SolveWhich of phrases given below each sentence should replace the phrase printed inboldtype to make the grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
Q1:

Despite of their differences on matters of principles, they all agree on the demand of hike is salary?

A Despite their

B Despite of the

C Despite for their

D Despite off their

E No correction required

ANS:A - Despite their

No answer description is available.