When Looking Back on Past Choices, Some People Feel They

When looking back on past choices, some people feel they should have exercised more and eaten less. The fact that they could not make that choice at that point in time is an example of less than optimal choices resulting from the:

A) complicated nature of the choice.
B) fact that the benefits and costs of choices are separated by time.
C) fact that we don't make food and exercise choices very frequently. D. market system within which we make choices.
D) market system within which we make choices.