Read the following sentences:

There isn’t anything to eat in the house. Let’s order a pizza.

Which revision below is a complex sentence?


There isn’t anything to eat in the house, so let’s order a pizza.


Since there isn’t anything to eat in the house, let’s order a pizza.


Because there isn’t anything in the house, let’s order a pizza, so we’ll have something to eat.


Let’s order a pizza; there isn't anything to eat in the house