Mrs. smith has blood type a. her father has blood type a, and her mother has blood type b

The baby has a 25% chance of having Type AB blood.

It is kind of obvious that the baby has a 25% chance of having Type AB blood.

true is the final answer!

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.