It is 2018. Bob and Nancy are married and file a joint return. They are both under age 50 and employed, with wages of $50,000 each. Their total AGI is $110,000. Neither of them is an active participant in a qualified plan. What is the maximum traditional IRA deduction they can take for the current year?

a. $0
b. $5,500 

c. $7,700

d. $11,000