Choice "A" is correct. An automobile for personal use is a capital asset.
Choice "c" is incorrect. Depreciable business property is a Section 1231 asset, not a capital asset.
Choice "b" is incorrect. Accounts receivable for inventory sold is an ordinary income asset, just like the original inventory.
Choice "d" is incorrect. Real property used in a trade or business is a Section 1231 asset, not a capital asset.