The correct answer is C. ampere.
An ampere is the SI unit of electric current. It is the flow of electric charge per unit time. The ampere is one of the seven base units in the International System of Units (SI). It is named after André-Marie Ampère, a French physicist and mathematician who is considered one of the founders of electromagnetism.
A volt is the SI unit of electric potential difference, electric potential, electromotive force, and electric tension. It is named after Alessandro Volta, an Italian physicist and chemist who invented the voltaic pile, the first electric battery.
A watt is the SI unit of power. It is equal to one joule of energy per second. The watt is named after James Watt, a Scottish inventor and engineer who is considered the father of the steam engine.
An ohm is the SI unit of electrical resistance. It is the resistance of a conductor that allows a current of one ampere to flow when a potential difference of one volt is applied across it. The ohm is named after Georg Ohm, a German physicist who discovered Ohm’s law, which states that the current through a conductor is directly proportional to the voltage across it, and inversely proportional to the resistance of the conductor.
None of the above is the correct answer because it is not a unit of measurement for current.