Final answer:
The correct answer is (a) a negligible amount, as the disposal of Keurig coffee pods represents a small fraction of their total environmental impact.
Step-by-step explanation:
The disposal of used single-use coffee pods from Keurig systems, while concerning to many due to their lack of recyclability, actually makes up a small fraction of their total environmental impact. The correct answer to the question is (a) a negligible amount of their total environmental impact. Even though these coffee pods are not widely recycled, their disposal represents a minor part compared to the entire lifecycle of the product, which includes manufacturing, distribution, and use.