"reflects a small percentage of the sunlight that strikes it"
Explanation:
Mercury has no atmosphere and it being very close to sun receives large amount of sunlight. due to absence of atmosphere, much of the sunlight reach the surface of the planet and gets absorbed by the surface making it very hot for life. Only a small percentage of sunlight that strikes the surface gets reflected.
We want to know what does the fact that Mercury has no atmosphere tell us. Since Mercury has no atmosphere it cant reflect a lot of sunlight that is hitting its surface. Its constantly being hit by solar wind. So Mercury reflects a small percentage of the sunlight that strikes it.
