Answer:
b. Compared with unemployment rate, employment rate is better because it concerns the hidden unemployment in the out of labor force group.
Step-by-step explanation:
Remember, the employment rate is used to determine the degree to which the labor force (people willing to work) in a particular economy are able to find work.
Hence, it does not concern itself or takes into account the hidden unemployment in the out of the labor force group, but only those people willing to work are considered.