Question people (in, on, of, with) the project

[hirashin]

Would you help me again?

Which preposition woud sound right here?
People (in, on, of, with) the project are hardworking.

Thanks in advance.
Hirashin

 

[Buntaro]

"On" is clearly the best choice.

Prepositions in English are really difficult.

Hey Hirashin, with all these corrections, you should publish a book!