Art's At-Risk Amount in a Passive Activity Was $60,000 at the Beginning

Art's at-risk amount in a passive activity was $60,000 at the beginning of 2016. His loss from the activity in 2016 is $80,000, and he had no passive activity income during the year. Art had $20,000 of passive activity income from the activity in 2017. Under the passive activity loss rules, Art's suspended loss at the end of 2017 is:

A) $15,000.
B) $20,000.
C) $45,000.
D) $60,000.
E) None of the above.