Everyone drove (his, their) own car to the scout meeting.

a. his

b. their

My teacher says the Everyone is a singular but this only sounds correct with their..
What is the correct version?

Your teacher is correct (of course!).

So it is not "Their" ?

It is NOT "their"!

Thank you !

You're welcome.

In this sentence, the correct version is "their." Here's why:

The word "everyone" is indeed a singular pronoun. However, when it is used to refer to a group of people in a general sense, it is common to use the plural pronoun "their." This is known as the "singular they" or "epicene they" construction.

It is preferable to use "their" instead of "his" in this sentence because using "his" would suggest that only males attended the scout meeting, which may not be the case. Using "their" is more inclusive and gender-neutral.

So, the correct version of the sentence is: "Everyone drove their own car to the scout meeting."