Answer:b.40
Step-by-step explanation:
Our brain is not made to completely focus on two things at the same time however we tend to focus on multiple things even when we get into our cars and that whilst driving .
Our brain has a limited capacity to process certain information at a time (cognitive load).
If we engaged in a conversation intead of totally focusing on driving we have to split part of our brain focus to that issue plus driving all at once which is too much for the brain to handle.
This has an impact on the quality of our driving we may end up driving badly than we would normal do if we were fully focused.