When the information is written or spoken in a ones' personal point of view. Also, information or research about the subject should come from a credible resource or website. An opinion could be biased. Consider, the credentials of the writer in relation to the subject matter or topic. The format as well as the event and time of the writing or statement is important as well. Consider what type of audience the writing was created for and what organization published the writing.
If the word advent means to get something or to be introduced to it, and the function of the microwave is to take less time preparing dinner, B is the most natural option.
