The grammatical function of the bolded noun clause in this sentence is the object of a preposition.
- The object of a preposition simply refers to the noun or the pronoun that comes after the preposition in a particular sentence.
- Based on the information given, the bolded words are to be in the car and ready to go in five minutes. This implies that the object, in this case, is car while the preposition is "the".
- Therefore, the bolded words simply showed that it's the object of the preposition.
In conclusion, the correct option is D.
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