What's the relationship between susceptance and reactance?
Impedance consists of a real part (reistance) and an imaginery part (reactance). Admittance, defined as the reciprocal of impedance, also has a real part (conduction) and an imaginery part (susceptance). If you have a pure reactance, for which the resistance is 0, then the formula reduces to admittance = 1/jX, where X is the reactance. This, in return, simplifies to admittance = -1/X. Thus the answer is that B, the susceptance is equal to -1/X.