For this case we can translate the sentence given as:
In hot weather I prefer to play ________ volleyball.
We must complete the sentence with the most successful option.
In Spanish, when the preposition "a" is used followed by the article "el", a contraction occurs, that is, the article contracted is "al". In Spanish it is not correct to write: "a el"
Then, the sentence can be completed as:
In hot weather I prefer to play volleyball.
Cuando hace calor prefiero jugar al voleibol.
Answer:
Option B