The correct option is A causes
The appropriate verb option is - cause. Simple present tense is used to indicate facts. The given statement explains a fact. Therefore, the verb has to be in the simple present tense. The syntax for simple present tense is: Verb in its base form + (s / es) (wIth singular subject) / verb in its base form (with plural subject). 'Bad driving' is a singular subject, therefore, the correct option is: causes.