Context: It was all stuff I already knew . What was n't common sense was stuff that if anyone were to spend a few minutes online researching , they should have already figured out . A lot of things they were saying I already knew did n't apply to me .

Question: Why was the information already well known the the person ?
Options:
0. The information was from previous research .
1. All the information was taught in the schools .
2. This information was common sense and did not need explaining .
3. All the information was posted online in previous posts .
Answer: 2