Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A decrease in both the labor force participation ratio and the unemployment rate is most likely caused by:
Option A:an increase in discouraged workers.
Option B:an increase in underemployed workers.
Option C:a decrease in voluntarily unemployed persons.

Answer: A