Ruang, a Single Taxpayer, Purchased Her Principal Residence on August

Ruang, a single taxpayer, purchased her principal residence on August 19, 2018 and financed the purchase with a mortgage secured by the residence. In 2018, the average balance of the mortgage was $817,000, and Ms Ruang paid $35,000 of mortgage interest. How much of this interest is an itemized deduction?

A) $0
B) $20,270
C) $32,130
D) $35,000