Answer:
c. 50%
Explanation:
According to the Internal revenue service, if the joint return is filled with the income below $32,000 then no tax liability would arise
But if the income lies in between $32,000 to $44,000, 50% of the benefits is taxable and if the income exceeds to $44,000, 85% of the benefits are taxable
Since in the question, the combined income is $43,860 that is below $44,000 so only 50% of heir social security benefits are taxable