Most English noun plurals end in -s.
An adjective clause is a type of clause that also contains a subject and a verb, but functions to describe a noun. This clause is often introduced by pronouns such as whom, who, that, which and the adverb where, when and why. In the given sentence above, the adjective clause is, "who received a good grade". This clause describes the noun "student".
Umm if you want to copy and paste you should give credit to the writer in quot like "My name is Jayden B******"