Answer:
They should sit together for sometime and discuss the reasons for their arguments.
The most probable and most likely answer to this problem would be C. revealed much about their behavior.
Out of the four options presented in this problem, C. would only need a complete subject to make it a correct sentence. Options A. by closely watching and gathering data and B. to terrifying effect would probably need other more words and/or phrases to make them more complete. D. insect studies, on the other hand, can also be considered as a correct option IF insect become the subject.
Hugh has lived on 3678 Tulsa Street, St.Louis Missouri for fifteen years.
The answer would be an echo because the echo is a reflection of your own voice. Which is why an echo can ‘speak without a mouth and hear without ears.’ However, an echo is only heard when the wind conditions are optimal, so it ‘comes alive with the wind.’