Final answer:
The main idea of the text is that there are serious human and environmental costs to purchasing trendy and cheap clothing.
Step-by-step explanation:
The best answer for this question is b. There are serious human and environmental costs to purchasing trendy and cheap clothing. The text mentions that the fashion industry is being scrutinized for its environmental impacts and unethical labor practices, and consumers are demanding responsibility from retailers. It also states that the industry is responsible for a high environmental cost due to processes that release harmful chemicals and the use of non-biodegradable packaging and materials. These details support the idea that there are serious human and environmental costs associated with fast fashion.