E5A10 - Amateur Extra Class

E5A10 : What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries, and C is 10 picofarads?
A 7.12 MHz
B 23.5 kHz
C 7.12 kHz
D 23.5 MHz
Correct Answer: 7.12 MHz