Audacity refers to aggressive boldness or unmitigated effrontery. Thus, option (c) is the correct answer. The meanings of the other words are highlighted below:
Entwine: Tie or link together
Pokerfaced: Deliberately impassive in manner
Wantonness: The trait of lacking restraint or control; reckless freedom from inhibition or worry
Shamelessness: Behaviour marked by a bold defiance of the proprieties and lack of shame