Final answer:
Donna's charitable contribution deduction is based on the fair market value of the stock at the time of the donation.
Step-by-step explanation:
a. Donna's stock donation to the American Red Cross is a charitable contribution.
The stock is treated as long-term capital gain property because she held it for over a year before donating it.
Her charitable contribution deduction is equal to the fair market value of the stock on the date of the donation, which is $35,750.
b. If the stock had a fair market value of $21,450 instead, Donna's charitable contribution deduction would be $21,450.