Jack Is Maximizing Utility by Consuming Soft Drinks at $2

Jack is maximizing utility by consuming soft drinks at $2 each and four pieces of pizza.The last soft drink gave him 100 units of utility and the last piece of pizza gave him 50 units of utility.The price of a piece of pizza is

A) $3.00.
B) $1.50.
C) $1.00.
D) $0.50.
E) $2.00.