Michelle is writing a paper on recent developments in the car industry. she gets a book from the library and also decides to look through recent online issues of engineering journals for information. the book she finds was written by andrew hopper, an engineer from pennsylvania state university, and contains quotes that agree with michelle's thesis that electric cars will be in wide use within ten years. the book was published in 2000. michelle finds the online articles through links at university websites which are also written by respected engineers in the field. they were all published in 2003. what is one way for michelle to decide which source is more credible? a. the book is more credible because the journal articles were found on the internet. b. the journal articles are more credible because they are linked to university websites. c. the book is more credible because its author is an engineer. d. the journal articles are more up-to-date, so they are more credibl