Beshears & Gino $(2015)$ note that not all problems can be solved using behavioral economics. Which of the following would not be able to be solved through the use of applied behavioral economics?

a$.$

In an effort to help employees eat healthier, fruits will be placed at eye level in the company cafeteria and the sugary snacks will be placed on the lowest shelf near the floor.

b$.$

In an effort to encourage employees to lower healthcare costs to the company, employees will be incentivized to use online pharmacies instead of walk$-$in pharmacies.

c$.$

In an effort to increase customer satisfaction, employees in call centers will undergo extensive training to ensure they know how to handle the most disgruntled customers.

d$.$

In an effort to nudge employees to turn in their weekly progress reports on time, the company will send the report as a weekly email that the employees need only reply to with a simple $$yes$$ or $$no$$ when approving the weekly stats.

e$.$

In an effort to get employees to save more for retirement, the Human Resource Director has plans to change the retirement system from an opt in program to an opt out program.