Answer:
The correct answer is option B, alternating current.
Step-by-step explanation:
An alternating current is the one that changes its direction periodically. Not only the current it is the voltage that also reverses with the direction of current. It is used to deliver power to industries, houses, office buildings, etc. The added advantage of AC over DC is that it can be easily transformed to higher or lower voltages and also current can be send easily to long distances through an AC electric current.