To establish whether you've found a credible source, you should consider the credentials of the a. editor. b. publisher. c. distributor. d. audience.

B. publisher

Explanation:

When trying to establish whether a particular source is credible or not, you should first look at the credentials of the author. Secondly, you should look at the credentials of the publisher. Respectable publishers include established publishing houses, universities, peer-reviewed journals and established newspapers. While this does not guarantee that the information presented is correct, it does provide more security for the researcher.