E seems fishy to me...I think it should be 'possess' than 'possesses'.
Good catch! None of the answer choices seem correct. I've also overlooked this point!!
Here is an example to clarify this point.
Ex-1: Thirty percent of Vivek's money is
Money is non-countble noun - So singular verb is in order.
Ex-2: Thirty percent of Vivek's investments are
"Investments" is countable plural noun -- Thus, plural verb "are" is required.