Sentence Correction

8. After comparing my air conditioner with the one on sale, I decided that mine was the most efficient.

A. was the most efficient.
B. should be the most efficient.
C. was the more efficient.
D. was, by far the most efficient
E. should be considered the most efficient.

OA is C. Can someone please explain? I thought it was choice A

When do you use more/most?

Thanks!

Just remember this simple rule,

When u compare 2 things use more.

When u compare many things together,use superlative,most

In this case the airconditioner is being compared to another one on the sale, comparing 2 things, therefore Answer is C

Hope that helps

Hey Hustonrockets,

We use most when we compare something to a group.

Like, I get the most marks in the class.

However, when we compare two things, we use more.

Like, Chris got more marks in English than I did.

Thank you both very much

any comments on use of 'the' in C option?
shouldn't we use 'the' with 'most'