Unless teacher is agree, the class will continue and three will be a test.

Teacher is agree it implies that either class will not continue or there will not be a test.
The class will not continue or there is a test implies that teacher is agree.
Teacher is not agree and the class will not continue implies that there will be a test.
None of these

Correct Answer: The class will not continue or there is a test implies that teacher is agree.

Explanation:

This belongs to Type 3: "Unless X, Y and Z"
this statement implies that:
(~ X → Y or Z)
(~ Y or/and ~ Z → X) Given in option (B)

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