Refer to the figure below. The opportunity cost of increasing medical care from 200 to 400 units is __ the opportunity cost of increasing medical care from 400 to 600 units.

Refer to the figure below. The opportunity cost of increasing medical care from 200 to 400 units is __ the opportunity cost of increasing medical care from 400 to 600 units.

A.twice as much as

B.less than

C.exactly the same as

D.greater than

正确答案:less than