I would choose answer C.
this is because the format of the essay is been informative, and that sentence was opinion orientated, while all the other options presented statistics.
A useful small Japanese calculator
"C", "Maybe".
The credibility depends on the websites contents and credentials.
A website like a government's page is considered, "credible", because it is from a trusted source; the government. Whereas getting a random answer from Yahoo is considered less credible because of it not stemming from a trustable source.
Hey, it's TeenSuicide.
