The problems associated with the decision of whether to lunch at Popeye's, Burger King, Taco Tico, or Little Saigon (a Vietnamese restaurant) illustrate:_______

a. how direct competition affects consumer behavior.
b. how some products and services are competitive substitutes for each other.
c. the strange food tastes of some of us-I mean, Taco Tico?
d. the universal nature of competition. e, that some people just can't make up their minds.