The correct answer is B. amps.
Current is the flow of electric charge through a conductor. It is measured in amperes (A), which are named after André-Marie Ampère, a French physicist and mathematician who is considered the father of electromagnetism.
Volts (V) are the units of electric potential difference, or voltage. This is the difference in electrical potential between two points in a circuit.
Ohms (Ω) are the units of electrical resistance. This is the opposition to the flow of electric current.
Farads (F) are the units of capacitance. This is the ability of a capacitor to store electric charge.
Diodes are electronic components that allow current to flow in one direction only.
I hope this helps!