an effective conclusion should do which of the following

Clarify the theme of the story
Leave conflicts unresolved
Show that all of the characters are happy
Leave the reader questioning

A effective conclusion should clarify the theme of the story and leave the reader satisfied with a sense of closure. It's important to tie up loose ends and resolve conflicts, rather than leaving them unresolved. A conclusion should also provide some sort of resolution for the characters, but this doesn't necessarily mean that they all have to be happy. Ultimately, a conclusion should leave the reader feeling satisfied and not questioning major aspects of the story.