Answer:
Comprar
Explanation:
The correct answer choice is comprar because it means to buy.
My mother likes to buy(comprar) milk at the store.
The other options aren't correct at all.
Nadar- swim(you can't say she likes to swim milk at the store)
Aceptar- accept(you can't say she likes to accept milk at the store)
Comprar- buy (she can buy milk at the store)
Enseñar- teach(she can't teach milk at the store)
All the other options are very incorrect and makes no sense except the option comprar which means to buy.