Was a FT ee in 2020.I earned $4k doing some side work. No taxes withheld from $4k. Is Schedule C needed? Sold car in 2020. It was used pers

I have taken deductions in the past for the portion of the car used for biz. I'm just not sure how to handle the question "did you stop using this vehicle in 2020"? I did stop using it but b/c of selling it.