Angles of a Triangle

You need to think about the right answer.

The vertices of triangle ABC are A(-1,-1) B(-1,2) C(6.0). What conclusion can be made about the angles of triangle ABC? 
It's a multiiple choice question:

A) the measurement of angle A is equal to the measurement of angle B

B)the measurement of angle ABC is equal to 60

C) The measurement of angle A is equal to the measurement of angle C

D) the measurement of ACB is equal to 90

Clearly....D is not correct

And C is not correct....for angle A to equal angle C, BC would have to equal BA

And A is not correct, either....for angle A to equal angle B, BC would have to equal AC

To find the measure of angle ABC we can use:

arctan (7/2)  = 74.05°

Mmmmm....doesn't appear that any of the choices are correct......here's a pic