Roads must be kept in good condition because a.
drivers need to be able to go as fast as they can.

b.
the roads look bad if they are cracked.

c.
roads must be flat enough to drive on.

d.
people and goods travel on roads.

C Roads must be flat enough to drive on

Explanation:

the personification of the word prudence d) it effectively enhances the logos and ethos of the argument.

logos means appeal to the logic or reasoning of the people.

ethos means appeal to the credibility of the argument, that it is worth listening to and acting upon.

i think that the answer is a