Which of the following most likely functions as the climax in a story?

The beach was hot, humid, and full of so many sweating people

I was convinced they affected the climate.

I was able to grab the rope just as the canoe full of kittens was slipping away from the dock.

We had started the day optimistic that we would be able to finish the float on schedule.

I didn't understand what made the choir director so angry all of the time.