Answer:
<h2>
A. a</h2>
Step-by-step explanation:
The options for this question are:
A. a
B. m
C. 
D. AB.
So, among the options the first one can be the name of a point. Basically, because <em>m </em>means slope,
is used to name vector, because it has the arrow on top. And AB is used to name segments, where A is the beginning and B if the ending.
Therefore, the right answer is A.