Concept:
- Eco Mark is India's own ecolabel scheme for environment-friendly products, launched in 1991.
- It is run jointly by the Central Pollution Control Board (CPCB) and the Bureau of Indian Standards (BIS).
- Its logo is a simple earthen pot, chosen because a plain clay pot is a traditional, biodegradable, low-impact object, it stands for minimal harm to the environment.
- Green star, green circle and the two-leaves twig are logos used by other labelling systems in other countries or for other Indian marks, not for Eco Mark.
Step 1: Identify the scheme correctly.
The question names the Eco Mark scheme run by CPCB with BIS, so we need that scheme's specific logo, not any generic eco-label.
Step 2: Recall what the Eco Mark logo actually looks like.
The Eco Mark logo is an earthen pot, picked deliberately because it is a common, everyday, fully biodegradable object that symbolises eco-friendliness in the simplest way.
Step 3: Rule out the distractor logos.
A green star and a green circle belong to other countries' eco-labelling systems, and the two-leaves/twig symbol is used for India's organic certification mark, not for Eco Mark, so all three are wrong here.
Final Answer: An Earthen pot