A blog, this is assumed as both the University and Museum websites are considered to be managed by informed, qualified individuals whereas on a blog the credentials of the writer are unknown.
When writing to get a job or college application, you should be totally honest. Like, raely put a joke or anything "funny" in it. Because when you fill these out, whatever you put in them, has to be true. Ex: Because, for one, if you get to the job/college, and can't do what you said you could do in the application. Your gonna get fired, or kicked out of college(maybe). It would be very embarrassing, and you could loose whatever you had.
I hope this makes sense, and I hope it helps!! Good luck ;)
The correct answer among the choices provided is the fourth option. Personal testimony was used by the speaker to prove his point. The speaker talked about his experiences on how Britain tried to stop the war in Europe. He is credible since he was a Cabinet member during that time.