13 . I believe it will become a massive hit among young people.A. 我相信它会在年轻人中大受欢迎。B. 我确信它一定会成为年轻人推崇的时尚。C. 我相信这些年轻人一定会备受欢迎。

步骤 1：理解句子结构
句子 "I believe it will become a massive hit among young people." 是一个复合句，其中 "I believe" 是主句，"it will become a massive hit among young people" 是宾语从句。
步骤 2：翻译主句
"I believe" 翻译为 "我相信"。
步骤 3：翻译宾语从句
"it will become a massive hit among young people" 翻译为 "它会在年轻人中大受欢迎"。
步骤 4：选择正确答案
根据翻译，正确答案是 A。