Why should you use courtesy when driving?

a. courtesy drivers interact on the road and keeps traffic flow moving.
b. when driving, you are always surrounded by other road users.
c. traffic laws require you to be courteous to other road users.
d. all of the above answers are correct.

"Courtesy helps drivers interact on the road and keeps traffic flow moving", "When driving, you are always surrounded by other road users" and "Traffic laws require you to be courteous to other road users" are the reasons why you should use courtesy when driving. The correct option is the fourth option or option "D". 

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what are the options