Which of the following individuals is practicing intertemporal substitution?
Select one:
a. Malika decides to stop being a stay-at-home mother and enters the workforce because the economy is booming.
b. Anneliese studies continuously throughout the semester for her final exams.
c. The United States enters a recession, and Tashika loses her job.
d. Sharona decides to stop being a stay-at-home mother and enters the workforce to get extra money for future college expenses.