Foundation
English
Verb
Tenses
Tenses
Question
but it __3__ never touch your collar.
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Solution
Option B is the correct answer as 'must' expresses compulsion or strong obligation which is correct in this context as maintenance of length of the hair is a compulsory rule to be followed.
Option A is incorrect because 'may' is used to express probability or likelihood, or a choice which is not the case as the hair length is a compulsory rule and not a choice.
Option C and D are incorrect because they are used in the past tense, while the rules to be followed obviously signify the future.