Answer: B - Mousse is the effervescence of sparkling wine. Specifically, mousse refers to the ability for a sparkling wine to form after a sparkling wine or champagne has been poured out of the bottle.
Light and airy in texture, the term mousse may also be applied to the sensation and feel provided by the foam of sparkling wine when it enters the mouth. A wine described as a soft mousse is not overly fizzy, a wine described as a harsh mousse may be excessively fizzy.