At What Frequency Will A $20.0 - \mathrm { mH }$

Multiple Choice

At what frequency will a $20.0 - \mathrm { mH }$ inductor have an inductive reactance of $100 \Omega$ ?

A) $796 \mathrm {~Hz}$
B) $225 \mathrm {~Hz}$
C) $655 \mathrm {~Hz}$
D) $457 \mathrm {~Hz}$
E) None of the other answers is correct.