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.

The unemployment rate is considered a lagging indicator because:
Option A:new job types must be defined to count their workers.
Option B:multi-worker households change jobs at a slower pace.
Option C:businesses are slow to hire and fire due to related costs.

Answer: C