Without sign ordinances, everyone with the price of a cane of spray paint can suddenly decide to create his own personal Picassos, and soon the entire town would start to look like something out of Alice in Wonderland. Therefore, we need sign ordinances.
The author makes which of the following basic assumptions?
I. Spray paint is used for many signs.
II. The entire town looking like Alice in Wonderland is undesirable.
III. Sign ordinances are effective.