The correct option is C are not to start
The correct answer here is Option B) - 'Are Not to Start'. This is because this phrase satisfies the rules of proper grammatical convention the best and follows the tense of the sentence as well (in this case, primarily present). The answer is not to start as with orders, we use the infinitive form of the verb (to + root verb) when one verb is already conjugated ('are'). Thus, are not to start is the correct answer. All other options are incorrect.