The electricity is . . . . . . than coal. A. cheap B. to cheap C. cheaper D. cheapest

The correct answer is C. cheaper.

The word “cheap” is an adjective that means “not expensive.” The word “to cheap” is not a word in the English language. The word “cheapest” is the superlative form of the adjective “cheap,” which means “the least expensive.”

In the sentence “The electricity is cheaper than coal,” the word “cheaper” is used to compare the price of electricity to the price of coal. The sentence is saying that electricity is less expensive than coal.

Here are some other examples of how the word “cheaper” can be used:

• The new car is cheaper than the old one.
• I can get a cheaper flight if I book it in advance.
• This store has cheaper clothes than that store.

I hope this helps! Let me know if you have any other questions.