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The grammatical convention being tested here is the use of possessive forms and correct pluralization.

Choice A) is incorrect. "restaurant's kitchens" implies that there is one restaurant with multiple kitchens, which doesn't fit the context.

Choice B) is incorrect. "restaurants kitchens'" lacks proper possessive punctuation and doesn't align with the context.

Choice C) is incorrect. "restaurant kitchens'" implies that the kitchens of one restaurant possess something, which is not the case in this context.

Choice D) is the best choice. "restaurants' kitchens" correctly uses the plural possessive form "restaurants'" to indicate that the kitchens belong to multiple restaurants.