Which of the following statements best describes the characteristics of accumulating physical capital and humancapital?

A.

Physical capital accumulation is subject to decreasing marginalreturns, but human capital accumulation is not.

B.

Both physical capital accumulation and human capital accumulation are characterized by increasing marginal returns.

C.

Both physical capital accumulation and human capital accumulation are characterized by decreasing marginal returns.

D.

Neither physical capital accumulation nor human capital accumulation is characterized by decreasing marginal returns.

E.

Human capital accumulation is subject to decreasing marginalreturns, but physical capital accumulation is not.