Concept:The word most requires a plural noun that follows it.Explanation:The error is in part (a) of the sentence.The phrase “most food park” is incorrect because after most we need a plural noun.The correct structure is most+pluralnoun.For example: Mostdessertsaresweet.Therefore, “food park” must be changed to “food parks”.The corrected sentence is: “For most food parks marketing initiatives are restricted to a few hundred kilometres.”Part (a) is the only error; parts (b) and (c) are correct.Answer:(a)