Over the Past 50 Years in the United States

Over the past 50 years in the United States:

A) output per worker hour, capital stock per worker hour, the real wage, and the real rental price of capital have all increased about 2 percent per year.
B) output per worker hour, the real wage, and the real rental price of capital have all increased about 2 percent per year, whereas capital stock per worker hour has increased faster.
C) output per worker hour and the real wage have both increased about 2 percent per year, whereas capital stock per worker hour has increased faster and the real rental price of capital has remained about the same.
D) output per worker hour, the real wage, and capital stock per worker hour have all increased about 2 percent per year, whereas the real rental price of capital has remained about the same.