Assume that Dusty has $30 in income, the price of a loaf of bread is $1.50, and the price of a jar of peanut butter is $3. At the original income of $30, if the price of a loaf of bread decreased to $1 and the price of a jar of peanut butter increased to $5, then Dusty could buy a maximum of _ loaves of bread or a maximum of _ jars of peanut butter.
A.5; 20
B.20; 5
C.6; 30
D.30; 6
正确答案：30; 6
