Question 38130
The total of the angles must be 180 degrees, so andle Q must measure 180-(21+37)=122 degrees.  If B were true, this would need to be less than 90, so that's false.  If C were true, one would need to be 90 degrees, so this is false.  If D were true, two angles would need to be equal, so this is false.  So the answer must be A.