Jeremy's preferences for Sprite (x₁) and Fanta (x₂) are consistent with the utility function: U(x₁, x₂) = x₁ + 3x₂ . Suppose that the price for Sprite starts at $1 each, the price for Fanta starts at $2 each, and his income in the current time period is $30. If the price of Fanta increases to $2.5 each, what is the change in the quantity of Sprite due to the income effect?

Select one:

a. 0

b. -1

c. 1

d. -3

e. None of the above