There Are Three Items (A, B, and C) That Are

Multiple Choice

There are three items (A, B, and C) that are to be shipped by air. The weights of these are 4, 5, and 3 tons, respectively. The profits (in thousands of dollars) generated by these are 6 for A, 7 for B, and 5 for C. A total of 14 tons may be carried by the plane. There are four units of each available for shipment. What is the maximum possible profit for this situation?

A) 14
B) 20
C) 21
D) 22