The following sentences create an ineffective supporting argument: This paper took me three hours to write. I typed for most of that time. When I was typing, the words flowed onto the paper, and I rarely even had to think about them. The argument is ineffective because the supporting sentences:

a. Address the writing process and not the actual submitted work
b. Attack the teacher's character
c. Undermines the author's credibility
d. Offers examples from world affairs