Which of these $($real$-$life$)$ advertising slogans is MOST like an advocacy advertisement?

a$.$

Beef. It's what's for dinner.

b$.$

Got Milk?

c$.$

The New York Times. All the News that's Fit to Print.

d$.$

Bicycles Don't Come with Bumpers: Give Cyclists Room to Ride.

e$.$

Bread. It's ESSENTIAL.