Answer:
A: The National Archives
D: A weblog of a college history professor about her area of specialty
G: A .gov website
Step-by-step explanation:
Valid sources for online research are the ones that are credible, have information that can be trusted and are up to date with recent information. Also, the websites in which the author can be identified and has knowledge about the topic. Besides, the websites that have a domain like .edu that is used by educational institutions and .org that is for government institutions are valid sources. According to this, the options that might be considered a valid source for online research are:
A: The National Archives
D: A weblog of a college history professor about her area of specialty
G: A .gov website