Walton bought one full bitcoin in March 2020. His bases in the coin is $5838. In July 2021, he donated 0.25 of the coin to a qualified charitable organization. The fair market value of a full coin at the time of donation was $33,800. what is his deductible charitable contribution?

a: $1,460

b: $5,838

c: $8,450

d: $33,800