Maylin Goes to Her Local Sporting Goods Store to Buy

Maylin goes to her local sporting goods store to buy socks and jogging shorts.Socks cost $10 per pair and jogging shorts cost $15 each.At her current consumption bundle pair of 4 pairs of socks and 2 jogging shorts,her marginal benefit from the last pair of socks is 20 and the marginal benefit of the last jogging short is 30.Maylin should ________.

A) buy the same number of socks but buy an additional jogging short
B) buy one more pair of socks and one fewer jogging short
C) buy one more jogging short and one fewer pair of socks
D) leave her consumption bundle unchanged