You could avoid using contractions such as don't
revised:
"I am not the best in math. Why? I do not know."
Hope this helps! :)
Answer:
B
Explanation:
'Unfolding a line of thought, step-by-step, to try to convince the
reader of something'
this one makes the most sense and is what i believe the answer your looking for, taking it step-by-step and unfolding a line of thought is how you develop an argument so i am convinced this is the right answer.
1. saves the trees, as it doesn't waste paper
2. provides access to more information
3. is more interactive than offline education and helps control the classroom