Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A Bollinger Band “squeeze” occurs when volatility:
Option A:falls to low levels as the Bollinger Band widens.
Option B:falls to low levels as the Bollinger Band narrows.
Option C:rises to high levels as the Bollinger Band narrows.

Answer: B