Ted has decided to buy a burger and fries at a restaurant but is considering whether to buy a drink as well. If the price of a burger is $2.00, fries are $1.00, drinks are $1.00, and a value meal with all three costs $3.40, the marginal cost to Ted of the drink is

a. $1.00.

b. $0.40.

c. $1.40.

d. $3.40.

e. impossible to determine from the information given.