Answer:
The poem speaks about the hope that people have by the song of the caged bird, that people with similar experiences may feel as if they are not free but still have hope within them, like how the caged bird sings about freedom.
I would say
C) Simple yes/no questions.
Exact excerpt is given in the second paragraph. It is the correct answer because it describes the Vietnam war and the excerpt shows how it is inevitable because it would finally happen one day. How people feels about the news creates a visual imagery in the mind of the reader.
No wonder everyone became a luck freak, no wonder you could wake at four in the morning some mornings and know that tomorrow it would finally happen, you could stop worrying about it now and just lie there, sweating in the dampest chill you ever felt.
The feature detectors identified by hubel and wiesel respond to specific aspects of visual stimulation.
The answer is visual because with that stimulation they tried to find out the effect of unilateral vision on the primary visual cortex of the brain. According to the work done, it was suggested that if the developing brain is not exposed to superimposed images of the two eyes, it will never form the connections you need to process a three-dimensional scene. The purpose of the experiment was to find out how the brain can develop complex visual images.