在考研统考英语练习中，以下是一道典型的阅读理解题：
题目：
In the following text, identify the sentence that best supports the author's argument about the importance of online learning.
A) The increasing number of students enrolling in online courses demonstrates its growing popularity.
B) Traditional classroom settings are often more expensive and less flexible than online learning platforms.
C) Online learning has been shown to improve student engagement and retention rates.
D) Many employers now prefer candidates with experience in online learning environments.
答案解析：
正确答案是C。这句话直接支持了作者关于在线学习重要性的论点，因为它提到了在线学习能够提高学生的参与度和留存率，这是在线学习优势的直接体现。
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