A pump station uses an induction motor that requires a complex power of:

$$S_1=20/_36.87^circ$$ kVA

and a synchronous motor that requires a complex power of:

$$S_2=10/_-53.13^circ$$ kVA

The total reactive power (kvar) required by the pump station is most nearly:

A. 4

B. 20

C. 22

D. 30