The correct answer is C. recognition of.
In order to thoroughly appreciate something, first of all you need to have a particular knowledge about the subject. Then you need to observe it thoughtfully and come to your own conclusion. In the end, you need to recognize its value, regardless of whether you like it or not.
Stylistic device where the writer repeats the same word or phrase for the proper use of emphasis is called repetition. Authors use it both in poetry and in prose to make the idea clearer. There are many ways how authors employ repetition as it embraces many types such as anaphora, antithesis, epiphora and so on. All this tools are meant to emphasize the meaning of the words but they express this emphasis in different ways.
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