Answer:
I personally feel all the options allow a good evaluation in the annotation process in an author's piece, but I'll list below what I personally think is the best, but I believe this question is opinion-based.
1. How has the author supported the main ideas in the text?
<u> The main ideas and the technique the author uses to support their research or opinions are major key elements in annotating and comprehending the text.</u>
2. What important ideas does the text include?
<u> Thinking of all the ideas presented in the text and how they are important to the overall piece of work is important, relates to #1 though. </u>
3. How effective is the text structure in sharing the important ideas?
<u>Text structure! Many may overlook this but verses, poems, and even dialogue are all shown in different formats of text structures. It's important to view these things. </u>
These are good but...
What opinions are conveyed within the text?
What text structures does the author use?
I believe they kinda relate to the one's listed above.