选择题
2024 AMC 8 Problem 4: Missing Number
When Yunji added all the integers from 1 to 9, she mistakenly left out a number. Her incorrect sum turned out to be a square number. What number did Yunji leave out?
2024 AMC 8 第4题：号码缺失
当云姬把1到9的所有整数相加时，她错误地漏掉了一个数字。她的错误总和结果是一个平方数。云吉遗漏了多少号码
A.
5
B.
6
C.
7
D.
8
E.
9