Our natural tendency is to concentrate on what is going on ahead of where we are going, so you need to check your mirror

Question

Question: Our natural tendency is to concentrate on what is going on ahead of where we are going, so you need to check your mirrors__________.

Options:

1.  if visibility is poor
2.  before you answer your cell phone
3.  unless you are the only car on the road
4.  whenever you change speed or position

Answer 1

4. Whenever you change speed or position

Our natural tendency is to concentrate on what is going on ahead of where we are going, so you need to check your mirrors whenever you change speed or position (regularly).