The Answer: C. It explores what is important in life.
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The answer is: B. Thinking of his sweet love
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In Shakespeare's "Sonnet 29," the speaker feels depressed because he wishes he were wealthier, more gifted and prosperous, and that he had more friends. However, his mood changes when he becomes fully aware that his woman loves him. As a result, he feels happier and more enthusiastic.

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.