Which of the following is the best example of the acquisition of human capital?

A) A worker communicates more quickly and accurately with suppliers because of upgrades to

communications software.

B) A computer chip manufacturer introduces a faster processor for micro-computing.

C A worker receives new machinery enabling him/her to do the amount of work that was

formerly done by two workers.

D) A worker takes a training course that increases his/her productivity.

E) A government-sponsored program increases the amount of investment available per worker.