Jenna, who is single, sold her principal residence on December 1, 2017, and excluded the $150,000 gain because she met the ownership and usage requirements under Sec. 121. Jenna purchased another residence in Pensacola on January 1, 2018 that she occupied until July 1, 2018, when she received a new job offer from an employer in Miami. She sells the Pensacola residence on October 1, 2018 and realizes a gain of $40,000. Jenna is taxed on what amount of the gain from the sale on October 1, 2018? A) S0 B) $10,000 C) $20,000 D) $40,000