Final answer:
The term 'giddy with excitement' best reflects the feeling of anticipating a joyous event, making 'Giddy' the correct answer.
Step-by-step explanation:
Anticipating a joyous event, you might be described as being "giddy with excitement." The correct answer to the question is C) Giddy.
This term is associated with a feeling of elation or excitement, often to the extent of being lightheaded or excessively happy. The other options, such as gleaming and grinning, may also be connected to happiness but do not specifically describe the sensation of being overpowered by the emotion of anticipation.