The central idea of the poem is about colors
You didn't provide the possible answers, however, analogies provide sound logic and reasoning that easily persuades because it shows that the person speaking has a general understanding of the things that are debated and can critically approach the problems.
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You got the right answer its knack, knacks definition is having clever skill or a special talent
The rhyme scheme is ABAB up until the last two lines, which are CC. Rhyme scheme signifies which lines rhyme with each other, depending on the last word in each line. The As correspond with each other, the Bs correspond with each other, and so on.
The main idea of the poem is that one should not to give up pursuing a woman if at first she doesn't seem interested, because when she has finally been won over, her love will last forever. In other words, be patient, because a woman who is not easily wooed will provide the longest form of love.
The poet uses the "metaphor" of burning an oak. A metaphor is a comparison between two seemingly unlike things (in this case a woman/her love and an oak tree) without using the words "like" or "as" (which would make the comparison a simile).
The poet uses the metaphor of a wound to represent how deep love can go ("Deep is the wound, that dints the parts entire With chaste affects, that naught but death can sever").
