what battlefield event damaged ulysses s. grant's rising military reputation?

a. the deaths of nearly 25,000 union and confederate troops at the battle of shiloh in tennessee

b. the surrender of union troops to confederate forces in kentucky and tennessee

c. the deaths of nearly 25,000 union troops at fort henry on the tennessee river

d. the surrender of union forces to confederate forces at fort donelson on the cumberland river