Erica Walks into a Restaurant with a Friend

Multiple Choice

Erica walks into a restaurant with a friend.There is no one to seat them,so they find a table.The waitress strolls out,sits down at the table with them,chats for awhile,and then hands them the bill.Erica and her friend are shocked because

A) their affordances changed so suddenly.
B) they felt the restaurant wasn't very busy.
C) they were uncertain of the descriptive norms in the situation.
D) their script for a restaurant was violated.