Its straight
If it were a right angle it would be at a 90 degree angle
acute angle is less than 90 degree
Obtuse is more than a 90 degree angle
Straight is an angle that is flat and stays at a 180 degree
A C E is a straight angle bc it is at an 180 degree and is flat
If it were something like BCE or ACD it would be a acute angle
If it were ACB or DCE it would be obtuse.
This is probably the easiest way to explain it, hope it helps
