Amajor difference between ac and dc electricity is that

in AC the current constantly reverses direction, while in DC the direction of the current remains the same

Explanation:

The major difference between the two types of electricity is the following:

- DC (Direct Current): in this type of electricity, the charge carriers (generally, electrons) travel in one direction only - always from the point at lower potential to the point at higher potential. This type of current is the current created by cells or batteries, and it is used by portable devices (e.g. laptops, cameras, etc.)

- AC (Alternating Current): in this type of electricity, the charge carriers constantly change their direction of motion. In fact, in this case, there is a generator which provides an alternating voltage (which means that the polarity of the voltage is constantly reversed). This type of current is the one used by household appliances. Also, the electricity from power plants to the houses is also transferred as AC electricity.

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it would be c. predictability