Answer:
A. needs citation
B. common knowledge
Step-by-step explanation:
The first statement would not be considered common knowledge. This is because the statement contains a very specific assumption about the author that can only be proven right or wrong through the use of evidence. Therefore, the reader would most likely be interested in finding out where this information comes from and whether it is trust-worthy. On the other hand, the second statement is an example of common knowledge because the author can look at these publications himself and corroborate the information.