Correct option is E
The correct word for the given blank is ‘surplus’
(a)cobble means a small round stone used to cover road surfaces.
(b)giant means an abnormally or extremely tall or large person, animal, or plant.
(c)pervasive means spreading widely throughout an area or a group of people.
(d)deficit means the amount by which something, especially a sum of money, is too small.
(e) surplus means an excess of income or assets over expenditure or liabilities in a given period, typically a financial year.