____________ the global epicentre of the coronavirus outbreak, now has the highest single day death toll and three times more confirmed cases than any other country.

A. United States

Explanation: The United States, with the world’s third-largest population, has four times as many deaths as China, where the pandemic began, and which has the world largest population. By 16th April Thursday's afternoon the United States had almost 770,000 confirmed cases and 34,000 deaths.