Which of the Following Is the Best Example of the Acquisition

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

A) A worker receives new machinery enabling him/her to do the amount of work that was formerly done by two workers.
B) A worker communicates more quickly and accurately with suppliers because of upgrades to communications software.
C) A computer chip manufacturer introduces a faster processor for micro- computing.
D) A government- sponsored program increases the amount of investment available per worker.
E) A worker takes a training course that increases his/her productivity.