In parallelogram PQRS, diagonal PR is drawn. A student proves △PQR≅△SPR. To show that diagonal PR bisects ∠P, which pair of equal angles should the student cite as corresponding parts?
a) ∠PRQ and ∠RSP
b) ∠PQR and ∠PRS
c) ∠QPR and ∠RPS
d) ∠QRP and ∠PSR