Of all the four students, Ahmad is...............

[mohammedabo]

Of all the four students, Ahmad is...............
-cleverest
-the cleverest
The answer is cleverest. can you give me explanation?

 

[GoesStation]

Yes. It's a bad question. Both answers are correct. I find "the cleverest" more natural.

 

[emsr2d2]

It's also a poor opening. There is no need for "all".

Of the four students, Ahmad is [the] cleverest.

I would use the article.

 

[Rover_KE]

What is the source of that dodgy question, mohammedabo?

 

[Tdol]

Of all the four students, Ahmad is...............
-cleverest
-the cleverest
The answer is cleverest. can you give me explanation?

There is no explanation for that being the only answer. The other is clearly better.

 

[mohammedabo]

What is the source of that dodgy question, mohammedabo?

Facebook groups

 

[teechar]

Facebook groups

I think in future, there's no need to post material from such unreliable sources. Facebook is definitely not the best place to improve your English.

 

[tzfujimino]

Facebook is useful, but I agree with teechar that the one you're using as learning material seems to be of dubious quality, mohammedabo.