Read the following paragraph from the article.
The week of March 16, the Centers for Disease Control and Prevention, or CDC, quietly updated its guidance. It now says that hospitals low on surgical masks should consider ways to reuse them or to use them through an entire shift and scarves or bandanas could be used "as a last resort." However, some health officials warned cloth masks might not work.
Which idea is BEST supported by this paragraph?

(A) The CDC thinks cloth masks are just as effective as surgical masks against the coronavirus.

(B) The CDC changed its guidelines because it recognized there is a shortage of surgical masks.

(C) The CDC has always believed it was unnecessary for hospitals to use more than one mask a day.

(D) The CDC approved the use of scarves and bandanas long before updating their guidelines.