In 2019, Pamela purchased a commercial sewing machine for use in her childrens clothing business for $20,000. In 2021, she sold the machine for $15,000. Between the date of purchase and date of sale, Pamela depreciated the sewing machine by $6,000. What is the amount and character of Pamelas gain?

A. $1,000 Section 1231 gain

B. $1,000 Section 1245 gain

C. $6,000 Section 1231 gain

D. $6,000 Section 1245 gain