Correct Answer & Explanation
Option B
In negative imperative sentences:
• 'Do not + V₁' changes to 'not to + V₁' in indirect speech.
• 'Instructed' takes an object directly without the preposition 'to' (e.g., 'instructed the athletes').
• Pronoun 'your' changes to 'their' according to the plural object 'athletes'.
• Option D is incorrect because 'forbade' already carries a negative sense, so using 'not' with it constitutes a double negative.