The creator of the information is clearly stated
a. authority
b. objectivity
c. content

a.authority

Explanation:

This answer comes to a simple and logical chain of thought: since someone has created the information, no one has more knowledge or authority about that specific information than the one who has created it, because that's the person who knows what the information was supposed to do/mean/provoke.

reading poetry is challenging when you don't have or very little of social context and culture schema.

solution: read the introduction, the norm, or even explaination if you still dont get it.