Final answer:
The correct classification for pesticides based on their source is 'Both'. Pesticides can be classified into organic and synthetic based on their source. Some pesticides can be both organic and synthetic.
Step-by-step explanation:
Pesticides can be classified into different categories based on their source. Some pesticides are derived from natural materials or living organisms, and these are classified as organic pesticides.
On the other hand, synthetic pesticides are chemically formulated. Some pesticides can be both organic and synthetic, depending on their composition. However, some pesticides do not fall into either category. Therefore, the correct classification for pesticides based on their source could be c) Both.