Which phrase includes a subordinating conjunction and could be added to the text below to create a complex sentence?

Keep working hard ____________

(1 point)
Responses

because then you will succeed.
because then you will succeed.

and you will see results.
and you will see results.

but make sure to take some time to rest.
but make sure to take some time to rest.

it will make you happy.

because if you keep working hard, then you will succeed.