Answer:
b) green marketing.
Step-by-step explanation:
Green marketing -
It the method of selling the goods and services , considering the benefits to the environment , i.e. , being eco - friendly , is known as green marketing .
These type of goods and services are healthy for nature .
Hence , in the question , most of the fast - food restaurants are trying to use paper wrappers instead of plastic and thereby , trying to save the environment and encouraging green marketing .