The correct answer is [C] To improve (in value, quality, price, attractiveness); to add to (powers, qualities, etc.); to increase, raise to a higher degree; magnify; intensity. .

Enhance comes from Middle English enhauncen, Anglo-French enhauncer, Old French enhaucier. The last is equivalent to en + haucier (to raise)

Examples of use:

• The candlelight enhanced her allure.
• The recent improvements enhanced the value of the article.