Which phrase signals a cause-and-effect relationship?
a) who use
b) to prevent
c) and thus
d) they were

The phrase "and thus" signals a cause-and-effect relationship.

Ex: I didn't pay attention during class, and thus, got bad grades in class.

C) and thus

Explanation:

''And thus'' signals a cause-and-effect relationship.

for this, you need to remember something significant in your own life, for example, if you were bullied when you were younger, you can mention your memories on this and touch on how such treatment can harm other kids your age either physically or mentally. (racism, car crashes, a parent in the hospital are all very good subjects, think hard on it! )

hope i ! : )

nobody can answer this if you dont show us the shapes