The family gave father a gold watch on the …… of his fiftieth birthday. A. time B. event C. occasion D. celebration

The correct answer is: occasion.

An occasion is a special event or happening. It can be a birthday, anniversary, holiday, or any other event that is celebrated. In this case, the family is celebrating the father’s 50th birthday. They are giving him a gold watch as a gift. This is a special occasion for the father and his family.

The other options are not correct.

• Time is not a special event or happening. It is simply a measurement of the passing of days, hours, minutes, and seconds.
• Event is a general term that can refer to any happening. It does not necessarily have to be a special occasion.
• Celebration is a more specific term that refers to a public expression of joy or happiness. It is usually associated with a special event, such as a birthday or holiday.