Drinking basins of beer

Cold beer is one of the best things about sizzling summers. But how about drinking it out of a basin as quickly as you can? More than a hundred people participated in a beer drinking contest in Wuhan in which four bottles of beer, or 2,000 ml, was poured into a basin which contestants had to drink up. They split into two teams to drink as much as possible in five minutes. One man drank a basin of beer in just two minutes.

How many bottles of beer did they pour into a basin?

A. 2

B. 4

C. 6