In 2001, Dorothy bought Series EE U.S. savings bonds with face values of $2,500 for $1,250 each for each of her three grandchildren born in 2001: Josh, Ethan, and Brooklynn. The bonds purchased that year had a 19-year maturity rate. In 2020, each of the grandchildren cashed the bonds for college tuition down payments. Which of the following statements is true? O a. Each of the grandchildren must include $1,250 in their gross incomes for 2020. O b. The interest earned from the bonds is not taxable. O c. Each of the grandchildren must include $2,500 in their gross incomes for 2020. O d. Dorothy must include $7,500 in her gross income for 2020. O e. Dorothy must include $3,750 in her gross income for 2020