[Grammar] most; the most, best; the best

[dilodi83]

"His friend might be A. or B. but it is not the identity of the friend that interests me most/the most/ best/the best"

Which one (most, the most, best, the best) is correct and why?

Are they all possibile or are there any differences in meaning? Could you explain how to use them correctly, please?

Thanks in advance.

 

[dilodi83]

"His friend might be A. or B. but it is not the identity of the friend that interests me most/the most/ best/the best"

Which one (most, the most, best, the best) is correct and why?

Are they all possibile or are there any differences in meaning? Could you explain how to use them correctly, please?

Thanks in advance.