Relative clauses are types of dependent clauses complete independent sentences - they usually refer to a single word and modify them. Here, in this excerpt, the relative clause would be that we can see in nature. Relative clauses usually begin with pronouns such as who, what, that, etc.
I’m in hufflepuff! But was sorted into slytherin a few times. So I guess, slytherpuff.
Answer:
A: It takes place during a time when soldiers traveled on horseback.
Explanation:
Hopefully this helps!