Research shows smoking pot affects these are skills required for safe driving

Research shows that smoking pot affect FOCUS, CONCENTRATION, PERCEPTION, COORDINATION AND REACTION TIME. Through research, it has been discovered that smoking pot significantly impair the ability of a person to drive safely. This is because, the drug affect one's brain in diverse ways resulting in different abnormal reactions of the body system which greatly reduce one's ability to concentrate on driving successfully.

Ibelieve the answer is b cause its only saying what they were focusing on,not a hardship