1)You can spend $10 for lunch and you would like to purchase two cheeseburgers. When you get to the restaurant, you find out the price for cheeseburger has increased from $5 to $6, so you decide to purchase just one cheeseburger. This is best described as:

. the substitution effect of a price change

B. the income effect of a price change

C. a decrease in the buyer's reservation price.

D. an increase in the buyer's reservation price.