Clampett, Inc

Clampett, Inc. converted to an S corporation on January 1, 2018. At that time, Clampett, Inc. had cash ($40,000) , inventory (FMV $60,000, Basis $30,000) , accounts receivable (FMV $40,000, Basis $40,000) , and equipment (FMV $60,000, Basis $80,000) . What is Clampett, Inc.'s built-in gain or loss on January 1, 2018?

A) $30,000 net built-in gain.
B) $10,000 net built-in gain.
C) $0 net built-in gain.
D) $20,000 net built-in loss.
E) None of the choices are correct.