Which of the following sentences is correct?

The correct helping verb with the main verb 'leave' will be 'to' and not 'for', option B is, therefore, incorrect. When writing the helping verb 'to' alongside the main verb 'leave', we must ensure that the word 'not' is not placed between them, as this results in a split infinitive; option A is also incorrect. Since the 'coach' is a singular noun, the verb form for 'order' in present tense should be 'orders'. Option D is incorrect as it writes 'order'. Option C is grammatically sound and is the correct answer.