In the given sentence, the verb <em>to document</em> means to support a claim with evidence, such as quotations or references.
The rest of the alternatives are incorrect because in the statement the word document is a verb -not a noun as in option A- and it does not mean to record or register as in option B.
Hi, i am writing to you about my plans for this year in my school, i am hoping to achieve high grades and to be ahead on all homework and projects how about you?