The Gain or Loss on the Sale of Property Held

The gain or loss on the sale of property held as an investment is recorded on which one of the following forms or schedules?

A) Form 4797 if the sale was from an asset used for investment purposes by a taxpayer who purchased it with company money as a sole proprietor.
B) Form 4797 regardless if the asset was purchased for investment if the taxpayer is a sole proprietor.
C) Schedule D if the sale was an asset used for investment purposes by a taxpayer.
D) Schedule D if the sale was an asset used in a trade or business by a sole proprietor.