Question

There is only room for one more person in the backseat of the car _____ my aunty is too fat.
1. because
2. because of
3. because if
4. because for

Answer 1

because option 1 is the answer

Answer 2

There is only room for one more person in the backseat of the car because my Aunty is too fat. Because is the right option.
Hope this helps.