Cliff Is Married and Files a Joint Return

Cliff is married and files a joint return. His return shows AGI of $268,000 and a net tax liability of $51,375 on taxable income of $224,000. He has $30,000 of preference items and $21,000 of net positive adjustments (including adjustments for itemized deductions and exemptions) . What is his AMTI exemption amount?

A) $74,450
B) $45,000
C) $43,200
D) $31,250