I think it is C. However, it should just be rock and water/ice.
The pesticide will be in the animals that eat the grasshoppers, in the water table, in humans that eat the animals/crops and drink the water.
Answer:
A={1,2,3} is true statement
The massive rain forest is one of the major barriers to travel in the Congo region. The correct option among all the options that are given in the question is option "c". This rain forest is very dense in some places and it is almost impossible to pass through it. I hope the answer helps you.