Christa Has Made a $25,000 Pledge to the American Red

Christa has made a $25,000 pledge to the American Red Cross (a public charity) . Christa expects AGI of $200,000 this year. Which of the following assets should she donate?

A) stock purchased three years ago for $18,000 with a current FMV of $25,000
B) stock purchased six months ago for $28,000 with a current FMV of $25,000
C) $25,000 of cash
D) Christa should be indifferent among the three choices.