Let's organize this out a bit.
The passage states:
When the heat like a mist veil floats,
And poppies flame in the eye,
And the silver note in the streamlets throat has softened,
Almost to a sigh.
It is July.
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According to this passage, all these words are using sensory language. It appeals to hearing by suggesting the creek is mostly quite because the heat of summer has dried up its water
Answer: Choice C
Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia