The correct option is
D Occasion
Option C: 'Occasion' refers to 'a particular time, especially when something happens or has happened'. It refers to a special event, like a birthday.
It can be used here to refer to the person's 17th birthday here. A birthday is an
occasion that naturally occurs every year. Hence option C is correct.
Option A: 'Time' is a 'measurement of the existence in seconds, minutes, days and centuries'. It does not form a complete meaning here.
Option B: 'Event' is when 'something important happens'. 'Events' are organised social or public happenings. While looking for the most suitable option, 'occasion' is more favourable than 'event', as it's closer in meaning.
Option D: 'Celebration' means 'a special social event', like a party. The sentence does not indicate that any celebration is happening on the birthday, hence this isn't a suitable option.
These words do not form a complete meaningful sentence.
Hence options A, B and D are incorrect.