单选题 Distance education is different from self-study in that it ______.

A、 provides training-in-residence for students
B、 caters to the interest of each individual student
C、 is available to vast majority of students
D、 offers instructional service to students

【正确答案】 D

【答案解析】从第二段第一句话“Distance education and self-study are different．Serf-study materials provide no instructional service．”可以看出，远程教育与自学的不同之处在于自学不提供指导性的服务，所以选D。