Which sentence from this section supports the conclusion that many more Americans will be diagnosed with COVID-19?

A.) He explained in a recent interview, the novel coronavirus -- just declared a pandemic by the World
Health Organization -- is beyond containment.

B.)The only reason total U. S. cases aren't already skyrocketing is that coronavirus testing has been such a
mess that too few people -- just 77 by the CDC in the whole week of March 8- are being tested.

C.)And the idea has caught on so well among armchair epidemiologists that the #flatteningthecurve and
#Flatten TheCurve hashtags have trended several times on Twitter in recent days.

D.)Clearly, public officials and businesses are listening to the warnings of public health officials, as
evidenced by all the closings and cancellations.