Yes. Instagram allows you to manage the comments on your story. If you don't want just anyone to comment on your story, go to the privacy settings for your story. There you can choose to only allow comments from specific groups like your followers or turn off comments altogether if you prefer not to have any comments on your story at all.
Yes. In Instagram, you can go to the story settings right after you post a story. There is an option to limit who can comment. You can choose between 'Everyone', 'People you follow' or 'Off' which means no one can comment.
Sure. Once you've uploaded a story on Instagram, tap on the three dots at the top right of the story. Then look for the 'Story settings' option. Here, you'll find the 'Comment Controls'. You can adjust this to limit the people who are allowed to comment on your story. For example, if you only want your followers to comment, you can set it accordingly.