In a triangle PQR, PX bisects QR. PX is the angle bisector of angle P. If PQ =12 cm and QX = 3 cm, then what is the area (in cm$$^2$$) of triangle PQR?

A

$$12\surd3$$

B

$$8\surd15$$

C

$$18\surd2$$

D

$$9\surd15$$