Answer:
b. change lanes to the right when safe to do so.
Step-by-step explanation:
You are driving slowly in the fast lane of a freeway and there is traffic behind you in your lane. The driver behind you wishes to drive faster. You should: change lanes to the right when safe to do so. If you are driving slowly in the fast lane and there is traffic behind you, you should not be driving there. You should be driving on the right side, where slow vehicles go. Option a is wrong because if you stay in your lane you prevent the driver behind you to drive faster.