Answer: Marginal decision making
Step-by-step explanation: Her husband did not understand that while making decision, sometimes individuals have to choose option on margin basis.
If Simone decides to take all her time in the pool then she will loose the benefit she is getting from the bike. The value that Simone is getting from biking might be a little bit higher what she is getting from swimming.
This whole process brings her the overall development and its not the case of choosing one option over other.