Frank (48) and Suzanne (51) are married, and they will file a joint return for 2021. During the year, Frank earned $94,000 in wages; Suzanne earned $4,500 from a part-time job. They had no other income. What is the maximum amount the couple may contribute to Suzanne's traditional IRA?

A. $0

B. $4,500

C. $6,000

D. $7,000​