Yes, Because the part of the sentence "Although it is pretty" won't be able to function on it's own as a proper sentence. However the sentence "winter isn't as pretty as fall", Is a independent clause at the end of the sentence. Hope I helped, Look at the images, It will help! :D
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I believe this will help you.
https://www.mvorganizing.org/what-is-the-theme-in-the-story-the-reefs/#What_is_the_setting_of_the_story_the_reefs_by_Marcella_Morris
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it's 3, hope this help for others
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