In the question below choose the word(s) or phrase(s) which best fills the gap(s):
The students were suspended because they were ….
The correct answer is: A
Explanation
undisciplined means they have not been disciplined at all. Indisciplined means they have not been properly / suffiently disciplined.
INDISCIPLINED is therefore correct because, the school had suspended (not expelled) the student for not being disciplined enough. (that means, they would be given a second chance when they are willing to be fully disciplined.)