There Are Four Items (A, B, C, and D) That

There are four items (A, B, C, and D) that are to be shipped by truck. The weights of these are 3, 7, 4, and 5 tons, respectively, and the plane can carry 13 tons. The profits (in thousands of dollars) generated by these are 3 for A, 4 for B, 2 for C, and 5 for D. There are three units of each available for shipment. The maximum possible profit for this would be

A) $9.
B) $11.
C) $13.
D) $15.