Context: They are able to travel up and down the country on a regular basis but again they have no guarantee of a having return loads . There are too many vehicles on the road which are being run inefficiently and without back loads . For the first Christmas ever internet shopping has overtaken the high street .

Question: Why is it inefficient to run vehicles without back loads ?
Options:
0. The loads you carry   on your back are not good .
1. Carrying something back to someone is unstable
2. It means the entire return trip there is nothing being carried - it wastes gas and time .
3. None of the above choices .
Answer: 2