Answer: D) Suffix.
Explanation: an affix is an addition to the base form or stem of a word in order to modify its meaning or create a new word. They can be at the beginning of the word (prefix) or at the end of the word (suffix). The particle "-less" that is at the end of the word "priceless" is an example of a suffix, added to the root word "price" so the correct answer is the corresponding to option D.
Julie is using 2. statistics as her main support.
By researching a bit, she found various types of statistics to help her support her argument that students should read at least 15 minutes a day. Her argument was that those students read for about 36 whole school days, whereas those who don't will read far less.