When evaluating the credibility of an author for an article, you should consider: Select one: a. The origin of the author's name b. The author's expertise in the subject area c. Whether the author was able to brainstorm a good title d. Where you can find the contact information for the author

You should consider B. the author’s expertise in the subject area. The other choices do not matter when evaluating credibility (or how trustworthy an author is on the matter).

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.