Variability deals with:

a. The degree to which we can directly relate a cost or benefit to a specific option.
b. How activities influence costs and benefits.
c. The result of performing activities.
d. The difference across decision options. None of the above.

Which of the following is the best example of substitution? a. movie producers begin making more comedies because they cost less to make than action films. b. people walk out before the end of a movie because the acting and the plot are terrible. c. people at the movie theater switch from popcorn to candy because popcorn has gotten too expensive. d. more people begin going to matinee movies instead of night movies to save money on the tickets.