The professor predicts that as students become more and more dependent on coaching classes in the coming years, coaching institutes have been mushrooming across the country.

A)coaching institutes have been mushrooming across the country
B)coaching institutes will mushroom
C)coaching institutes are mushrooming
D)coaching institutes should mushroom
E)coaching institutes will be mushrooming

OA: B

Please explain this problem.
I came down to two options B and E.And cant decide between the two,both seem to be right.In one way as the dependancy increases the coaching institutes will mushroom or as the dependancy increases the coaching institutes will be mushrooming(continued action)

Please clarify.