I pick (E).
If the restaurant is too crowded during lunch hour, the restaurant is not at its optimal level.
If the restaurant is too empty during supper hour, the restaurant is not at its optimal level.
We need to keep this restaurant at its optimal level for the whole day.
Attracting a lot of people into our restaurant (and thus getting high revenue) goes against our purpose since we're already doing a lunchtime performance to keep too many customers from coming to our restaurant at one time.
Auge um Auge, Zahn um Zahn !