I think the answer would be " C. understanding the author's purpose " because when you annotate something you aren't just describing it , you are formulating an explanation
D.) typed.
An adverb clause:
1) has a subject and verb
2) has a subordinate conjuction
3) answers one of the four questions: how? when? where? or why?
In the above sentence, the adverb clause is : AFTER I WROTE A ROUGH DRAFT.
1) subject - I ; verb - wrote
2) subordinate conjunction - after
3) when did I type? after I wrote a rough draft
The adverb clause modifies the verb "typed."
