The correct answer is (C) Showiness; pretentious display; particularly of wealth or luxury, unnecessary display of skill, knowledge, etc. to impress others; any actions intended to attract notice or impress others; showing off.

Ostentation comes from Latin ostendere (to show).

Examples of use:

• His ostentation included having his own table in a very expensive restaurant.
• His practice of giving large tips for even the smallest service is ostentation.