Please help with this question?

Dash purchased a new truck for his business in 2016. It was 100% for business use. He took $3,000 as section 179 expense deduction and depreciated the remaining costs using MACRS 200DB through the recovery period. In 2018, if his business-use percentage of the truck drops

to 50% or below, which of the following actions must Dash take:

a)Recapture Section 179 and Modified Accelerated Cost Recovery amounts that exceed depreciation computed using the Alternative Depreciation System.

b)Begin using the Modified Accelerated Cost Recovery System - Straight-Line Method.

c)Stop using the Modified Accelerated Cost Recovery System and begin using the Alternative Depreciation System.

d)Sell the property.