In quadrilateral PQRS, sides PS and QR have equal length and sides PQ and RS are parallel to each other. Point X is the intersection of the diagonals PR and QS. Which of the following conclusions must be true?
A) \(\triangle PXQ\cong\triangle RXS\)
B) \(\triangle SPR\cong\triangle RQS \)
C) \(\triangle SPQ\cong\triangle QRS\)