Suppose Hannah Spends $3 to Buy Five Biscuits

Suppose Hannah spends $3 to buy five biscuits.The marginal utility of the fifth biscuit is valued at $0.60.The total utility derived from five biscuits is valued at $4.20.Hannah's consumer surplus is valued at _____

A) $20.00.
B) $15.00.
C) $5.00.
D) $2.40.
E) $1.20.