[Grammar] There are many situations (which-when-whose-where)groups of people need to cooperate

[nado92]

There are many situations (which-when-whose-where)groups of people need to cooperate to succeed.

Do you prefer 'where or when'?

Thanks in advance.

 

[bhaisahab]

There are many situations (which-when-whose-where)groups of people need to cooperate to succeed.

Do you prefer 'where or when'?

Thanks in advance.

"where"

 

[I'm still learning]

I think it's gonna be WHERE

 

[nado92]

Thank you for your kind replies.