Which statement MUST be true?
Am∠PST = m∠RPQ
Bm∠TPS = m∠PQR
Cm∠SPQ = m∠TPR
Dm∠PQR = m∠PST
Am∠PST = m∠RPQ
Bm∠TPS = m∠PQR
Cm∠SPQ = m∠TPR
Dm∠PQR = m∠PST