Points A and B are the end points and C is somewhere between them.
In order to find the total length of AB, you would add CA and CB together.
The answer would be C. CA
Here we are given that C is between A and B.
So using the midpoint rule, sum of whole length AB will be addition of lengths AC and BC
so we can say that option C. CA is the correct choice as it satisfies the given condition.
