A．peaceful
B．quiet
C．silent
D．personal

单选题根据下面的内容，回答题.


We can tell from the results of the poll that

A．people are unconcerned about politeness nowadays.
B．"thank you" remains the best expression of gratitude.
C．there is a variety of expressions of appreciation.
D．there are more formal expressions than informal ones.

A．Thanks.
B．Cheers.
C．Brilliant.
D．You star.