I would say Carbon, Hydrogen and Oxygen.
The answer is D! Hope that helped
I would say that in very fast moving water such as in a river, the cobble size could be transported because cobbles are 64-256mm so are quite big and in a quiescent stream won't move much but in a freshet say in a steep mountain stream they can be rolled along such as I observed in the local streams at a mining town during the Hurricane Fifi in Honduras in 1974.
Answer:
I think it will mean that the words of the question represent the key-words of your thesis. So you mustn't change the words of the question while writing your thesis
