The complete triangle given has a height of 3 and a base of three - that means that the triangle Paula has to match it with has to have the same height and base. The base is already given: S = (5,3) & T = (8,3)
the triangle does not have to match the other one 100% - meaning, you can flip it the other direction(left) or upside-down
A - no number are on 4 so the triangle would be slanting
B - (5,6) matches - just flips to the left
C - (8,0) flips upside-down
D - (8,6) matches triangle RQP