The correct answer is (C) The horn of plenty; a goat's horn represented in art as overflowing with flowers, fruit, and corn; a conical receptacle containing food, drink, or anything, in abundant, overflowing supply. The horn of the goat Amalthea, which suckled Jupiter.

Cornucopia comes from Latin (cornu [horn] + copiae [of plenty]).

Examples of use:

• While recovering, she received a cornucopia of visitors, cards, and wishes.
• The centerpiece of the display was a large cornucopia of flowers and fruit.