Explanation:

- The average rate of growth of employment from 1950 to 2010 is a topic that requires analyzing historical employment data.

- This period involved various economic conditions, including post-war growth, recessions, and expansions.

- Option 1: A 1 percent growth rate would be quite low for such a long period across various economic cycles.

- Option 2: A 2 percent growth rate is a more reasonable estimate, reflecting moderate and steady employment growth over the 60 years.

- Option 3: A 5 percent growth rate is unusually high for employment across a broad time span like 1950-2010.

- Option 4: A 10 percent growth rate is exceptionally unrealistic for employment.

Given this analysis, Option 2: 2 percent is indeed the correct choice.