LDCs Tend to Put Fewer Resources into Human Capital Development

LDCs tend to put fewer resources into human capital development than they should primarily because

A) people are unwilling and too poor to devote the time required to increase their skills
And/or education
B) plant and equipment are too expensive
C) the returns to human capital take a long time to occur
D) the existence of patents limits the development of technology
E) the payoffs are relatively low