The principle of rhetoric is mainly to persuade and impress and the style can be grandiloquent, grandiose, flowery or extravagant for example. It can be helpful to say introduce a speaker who has a very good education, who is very knowledgeable, very experienced, has excellent judgement and yet is modest for example and the above words could be used to praise him or her to give the audience a good impression of the person.
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This is definetly a tricky one, but you have to go back to the definition and meaning of 'theme.' A theme is the life lesson of a story or any other form of writing, movies, etc. So, I am not 100% on this, so I will say why I think for each answer. A; I definetly do not think it is A. B; doesn't sound right for me because even though the person in the poem is waiting for the bloom, he/she isn't talking just about waiting, he/she is talking about the time that is going by. C; It sounds like the cherry blossoms may bloom every year, but its not completely clear and doesn't fully match a theme. D; It sounds like the man/women is contemplating the life they have lived through seeing the cherry blossom for years. So I would say the and answer is D since that makes the most sense to me. Hope this helps! :)
Look at how the character change or grow
Hope this helps :D