In the diagram, ∠RTS and ∠STU are supplementary.

A straight line RU with T at the center. Two angles TQ and TS are observed.
What is the value of x and what is the measure of ∠QTR?

A.
x = 15; m∠QTR = 30°
B.
x = 30; m∠QTR = 60°
C.
x = 15; m∠QTR = 60°
D.
x = 30; m∠QTR = 30°