It's sentence 3.
The ambiguous pronoun is "her". It is unclear whose graduation happened that day.
Hope this helps :)
The prefix is the beginning part of a word (for example, the “un” in ungrateful). The root word is the original state of a word that can grow longer with prefixes and suffixes (for example, “play” in Replay). A suffix is a part at the end of a word (like “ful” in ungrateful). These word stems/parts of words have different meanings that can sometimes help determine a meaning of a word. Some words may not have all parts (prefix, root, suffix), though. These are words like “preschool” (prefix: pre and root word: school) and younger (root word: young and suffix: er). I hope this helps you out! Good luck :)
If my memory serves me well, the right answer sounds like this Wright’s mother mainly worries that the publication of his story will harm his relationship with his family.
When using quotes in an essay (which teachers often look for) make sure that the quote addresses the prompt. Also, make sure to use quotation marks and cite where the quote came from by using the authors surname and page number.
For example "The Dursley's of number four Privet Drive were proud to say they were perfectly normal, thank you very much." (Rowling 1).