Final answer:
Jillian's maximum allowable medical expense deduction for 2020 is $4,875.
Step-by-step explanation:
To determine Jillian's maximum allowable medical expense deduction for 2020, we need to consider the requirements set by the Internal Revenue Service (IRS).
Medical expenses are deductible if they exceed 7.5% of the taxpayer's adjusted gross income (AGI). For Jillian, this would be 7.5% of $120,000, which is $9,000.
However, only qualified medical expenses can be included in the deduction. In this case, the qualified medical expenses include Jillian's own doctor and dentist bills ($6,750), prescribed medicines ($300), and nonprescribed insulin ($825), totaling $7,875.
Therefore, Jillian's maximum allowable medical expense deduction for 2020 would be the amount that exceeds 7.5% of her AGI, which is $7,875 - $9,000 = $4,875. Therefore, the correct answer is option c. $4,875.