Preston filed for divorce in August 2018 and his divorce became final on June 1, 2019. He has an AGI of $160,000 and normally itemizes his deductions. He refused to file jointly with his wife. He paid $5000 in state withholding, $9000 in real estate taxes, $1500 in charitable donations (with receipts), and $8000 in mortgage interest. What is the total of his allowable itemized deductions on Schedule A?

a) $23,500

b) $14,500

c) $19,500

d) $18,500

(This is based on the guidelines for tax year 2018).