If the author were to continue her research and write a new article about subtropical climates, which would be the most credible source to use? a. a memoir written in 2009 by an author who spent decades writing novels in the florida keys b. an educational web site that describes college students' research on subtropical climates c. a book written by a political candidate who was born and raised in a subtropical climate d. a u. s. government web site that describes current climate patterns in the florida keys