With no explanation, chose the best option from "A" or "B". Mandy lives in a house with its backyard facing the west, so it is very hot in the summer. Mandy wants to improve the hot condition in her backyard.

A: Mandy grows her favorite Lilac tree and Sugar Maple Tree in her backyard which provide plenty of shade.
B: Mandy installs a gazebo in her backyard which costs her several thousand dollars.
A.