Final answer:
Fiona may not contribute and deduct any amount to her traditional IRA.
Step-by-step explanation:
Finnegan and Fiona's AGI is $170,000. Fiona is not an active participant in her employer's qualified plan. According to the IRS rules, since Finnegan is an active participant and their AGI is above a certain threshold, their ability to deduct contributions to a traditional IRA is limited. In this case, Fiona may not contribute and deduct any amount to her traditional IRA (option c.) $0).