Ross and Reba are both in their 30s, and they are married. Reba earns $64,000 annually, and Ross earns $1,800 annually working part-time. Their adjusted gross income is $81,500. Reba participates in an employer-sponsored retirement plan. Ross and Reba contribute the maximum amount allowable annually to their IRAs. What is their allowable deduction for this year's contributions? a.$5,000 b.$6,800 c.$-0- d.$1,800 e.$12,000