Sharpness of resonance is directly proportional to:

Explanation

The sharpness of resonance in an electrical circuit is primarily determined by the Q factor, which is influenced by both inductance (L) and resistance (R). A higher Q factor indicates a sharper resonance, meaning the system is more selective in its frequency response. Inductance plays a role in determining the Q factor as it relates to energy storage in the magnetic field, while resistance relates to energy loss. Therefore, option C is correct because both the Q factor and inductance contribute to the sharpness of resonance. Option A is incorrect because it does not account for the role of inductance. Option B is incorrect as inductance alone is not sufficient. Option D is incorrect because resistance is inversely related to sharpness of resonance.