There are three major types of plate boundaries. If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, which is known as subduction. Deep trenches are often formed where tectonic plates are being subducted and earthquakes are common.
You press at the staple bellow the question that you ask and add a picture
Answer: B.
Explanation:
A comma is necessary when both sentences are independent clauses.
Both of the sentences stated above are independent clauses.
The first choice lacks a comma, while the third choice lacks a conjunction, which is used to add addtional information.
