Which triangle is similar to triangle pqr using the pieces of right triangles similarity theorem?

triangle srp has measure of angle srp equal to 90 degrees. q is a point on the hypotenuse sp such that the segment qr is perpendicular to ps. t is a point outside the triangle on the left of s so that triangle qts has the measure of angle qts equal to 90 degrees.

triangle rqs
triangle tsq
triangle qst
triangle srq