GMAT Sentence Correction (SC) | Re: Nobody knows exactly how many languages there are in the

Hi, I could narrow down between Options A and C. Then I selected C because I thought the use of HAVE in the underlined part is wrong in option A.

A. and the sub-languages or dialects within it, but those who have tried to count typically have found

C. and the sub-languages or dialects within it, but those who have tried counting it typically find

According to me the second part should be : HAVE tried to count typically find

Have connects past and present. Thus something happened in past (the