The correct answer is Comma because a coordinating conjunction isn't needed after a semicolon and a colon indicates a list and a dash id for breaking up a word or numbers like twenty-two or in-dex
For example you can say:
Dear Friend(or make up a name)
Today I went to the debate competition finals and it was amazing! We went against this school named (school name) and the competition was intense.
Or something like that, just giving you an idea. Make sure to add descriptive words and make sure to apply if you won or you lost.
Base on the story of the swimmer by F. Scott Fitzgerald, he reveal the setting of the passage by mentioning water and sand and the best answer among the choices is in the last choice. I hope you are satisfied with my answer and feel free to ask for more