The correct answer is A. Crude.
BAWDY: (adjective) characterized by or given to coarse humor or language.
CRUDE: (adjective) lacking refinement or sophistication; unpolished.
VULGAR: (adjective) lacking taste or refinement; coarse.
PROUD: (adjective) having or showing an excessively high opinion of oneself; conceited.
ARROGANT: (adjective) having or showing an attitude of superiority and contempt towards others.
BAWDY is most closely related to the word CRUDE. Both words refer to something that is lacking in refinement or sophistication. However, BAWDY is specifically used to describe something that is coarse or vulgar, while CRUDE can be used to describe anything that is unpolished or unrefined.
VULGAR is also similar to BAWDY, but it is more strongly associated with coarseness and obscenity. PROUD and ARROGANT are not synonyms of BAWDY, as they do not refer to something that is coarse or vulgar. Instead, they refer to someone who has an excessively high opinion of themselves.