Without hiding the fact that the destruction of Athens
was one of their most important objectives, the multitudinous Persian army, led by Xerxes and nine of his generals, marched westward toward Greece in the spring and summer of 480 BCE.
A. was one of
their most important objectives - Its because the pronoun refers to army which is collective noun. Hence singular.
B. was one of its most important objectives - Hold. Seems correct.
C. was one of the objectives
they considered to be most important - Same as A
D.
having been one of its most important objectives
E.
is one of its most important objectives - Tense is past> "was" instead of is
_________________
You give kudos, you get kudos. :D
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78% (00:37) correct 
