How Could Erbert Use Combinational Reasoning to Determine How Many

Multiple Choice

How could Erbert use combinational reasoning to determine how many different types of sandwiches could be made from eight available condiments?

A) He could map out all possible combinations on a sheet of paper.
B) He could move a slice of onion back and forth between two sandwiches until he can mentally visualize the action.
C) He could use both animism and egocentric thought to help him out.
D) He could visualize how a sandwich with one condiment would differ from one with all the condiments.