Final answer:
The answer to the student's question is b. Green economics. This field of economics focuses on sustainable development and addressing environmental needs within economic practices.
Step-by-step explanation:
Focusing on the use value of money, green economics concentrates on meeting human and environmental needs. The correct answer is b. Green economics. This branch of economics takes a holistic approach, considering the well-being of the environment alongside human prosperity. It shifts the focus from traditional economic growth to sustainability and equity within ecological constraints. Green economics is distinct from environmental economics, which integrates ecological concerns into traditional economic frameworks by pricing environmental factors but still operates within the growth paradigm. In contrast, green economics seeks a balance that allows for a sustainable relationship with the planet's resources and natural services.