Question

1. give another name for line r.

Explanation:

Step1: Recall line - naming convention

A line can be named using any two points on the line. Line $r$ passes through points $A$ and $C$.

Step2: Identify correct name

Since a line can be named with two points on it in either order, another name for line $r$ is line $CA$ or line $AC$. Among the given options, $CA$ is correct.

Answer:

CA