单选题

Which of the following is NOT an advantage of distance learning?

A The student may choose his or her own pace.

B The student may study at any time to his or her convenience.

C They can pursue their chosen career while studying.

D Their tutorial assistance comes through regular airmail, telephone, facsimile machine, etc.

解析：
文章提到的优缺点是几种教育方式之间的比较，问题涉及哪个选项的内容不是远程教育的优点。前三个选项，A“学生可以选择自己的进度”，B“学生可以在他（或她）方便的时候学习”，C“在学习的同时还可以追求自己的事业”都是文章中提及的与另两种方式比较的优点。在文章第二段中的一句话“Tutorial assistance may be available via regular airmail, telephone, fax machine, and over the Internet”（辅导可以通过定期的航空邮件、电话、传真以及因特网等方式进行），作者只是提出了一种可能，实际上是弥补远程教育不足的一个建议，并不是远程教育（函授）的优点。因此选项D符合题意。