【单选题】

{{I}}Questions 9 and 10 are based on the following news.At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news.{{/I}} Humans can distinguish about ______.

A、10,000 different odors
B．10 different odors
C．1,000 different odors
D．100 different odors