Answer:A. Austin enjoyed watching the episode of Mythbusters three times as much as Erin.
Step-by-step explanation:
Util is an economic theory derived by cardinalist school of thought, which says utilities is a measurable value and it's measure in utils. Utility refers to the satisfaction derived from the consumption of a good or service.
The cardinalist theory makes it possible to calculate the satisfaction derived by individuals from consumption of goods and services and it can be greater than one another.
From the results above since Austin utils is 15 and Erin utils is 5 it shows that Austin enjoys the film three times as much as Erin.