Refer to the given flow chart showing flow of energy in a food chain.Select the correct statement regarding P, Q, R and S.(i) S helps in cleaning of environment as well as recycling of nutrients.(ii) The role of Q comes when plants and animals die.(iii) P operate at all levels of food chain.(iv) R eats other animals and get its food indirectly from P.

• A. (i) and (iv) only
• B. (i), (iii) and (iv) only
• C. (iii) and (iv) only
• D. (i), (ii), (iii) and (iv)