Alex wants to construct a line segment through r that makes the same angle with line segment qr as line segment pq . the figure below shows a step to construct a congruent angle at r:

a line segment qr is drawn. pq is a line segment that makes an obtuse angle of about 120 degrees with qr. an arc, indicating the measure of angle pqr intersects pq at s and qr at t. another arc drawn from point r is a reflection of the first arc but of the same measure and intersects qr. a compass with its ends at points s and t is shown.

which figure shows the next step to construct a congruent angle at r?