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 .
According to the above context, choose the best option to answer the following question.
Question: Why was the information already well known the the person ?
Options:
A. The information was from previous research .
B. All the information was taught in the schools .
C. This information was common sense and did not need explaining .
D. All the information was posted online in previous posts .


C