Shelly's Company Produces Computers, Phones, and Tablets

Shelly's company produces computers, phones, and tablets. About six months ago, Shelly began to keep track of number of hours worked at the company, and the resulting output. When she compared the results, she found that the number of workers (and the hours they worked) remained relatively steady over the past six months; however, the work site's output improved considerably. This indicates that

A) productivity at the work site has increased.
B) the work site sold off some of its excess inventory.
C) the company's prices have increased faster than the wages paid to workers.
D) the company should hire more workers.