Agnes passes away in 2022 and leaves her daughter, Sam, 100 shares of stock. Agnes purchased the stock for $1,000 over twenty-five years ago. It was worth $10,000 on the date of Agnes’ death. Sam sells the stock a short time later for $10,500. What is the basis of the stock for computing Sam’s realized gain or loss?

a. $1,000

b. $10,000

c. $10,500

d. Some other amount