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Yes, they all mean people, but they each have different uses for different contexts.

In Task 2, you're probably talking about people IN GENERAL

e.g. "Some people think/believe/argue/claim etc"

So in MOST cases, the only word you need is "people".

Have a great weekend ("peeps"*)!

*"Peeps" is an informal/slang and quite annoying word for people (often used to refer to your friends or associates)

e.g. "Thanks for the help, peeps!"