Individual A purchased 100 shares of company M on 9/15/2017 for $5,000. On 2/15/2019, A sold all her shares in Company M for $4,000. On each of the four days from 2/16/2019 to 2/19/2019 (inclusive), A purchased 50 shares of substantially identical stock for $2,000. A did no other trading for the remainder of 2019. How much gain/(loss) does A recognize in 2019?

A. ($1,000)ST

B. ($1,000)LT

C. $0

D. $2,000