The correct answer is 'a.' Key Points - The error lies in Part (a) of the sentence. - As the word 'most' is present, we need to insert a plural noun after 'most.' - Structure: ........ most + plural noun........ - Example: Most desserts are sweet. - Therefore, the use of 'food park' should be replaced with 'food parks' to make it grammatically correct. - Correct sentence: For most food parks marketing initiatives are restricted to a few hundred kilometres.