I’m going to say D but I could be wrong
Whether you are assigned a general issue to investigate, given a list of problems to study, or you have to identify your own topic to investigate, it is important that the scope of the research problem underpinning your study is not too broad, otherwise, it will be very difficult to adequately address the problem
He is trying to sound optimistic even though he is not.
Answer:
I think Air and Sunlight is right answer
