Since the underlined portion of the sentence contains a verb, check whether the verb is consistent with the rest of the sentence. The singular verb is does not agree with the plural subject elements. This is a subject-verb agreement error, so eliminate choice A and look for any obvious repeaters. Choice B is an obvious repeater because it also uses the singular verb is, so eliminate choice B. Now evaluate the remaining answer choices individually, looking for reasons to eliminate each.
Choice C corrects the subject-verb agreement error by using the plural verb are, and introduces no new errors, so keep choice C. Choice D uses the construction being added to it. The singular pronoun it is ambiguous because it could refer to cuisine or foundation, so eliminate choice D for a pronoun ambiguity error. Choice E uses the phrase and, in addition, which communicates the same idea twice, so eliminate choice E for a redundancy error.
Choice A: No. The singular verb is does not agree with the plural subject elements. Subject-verb agreement.
Choice B: No. The singular verb is does not agree with the plural subject elements. Subject-verb agreement.
Choice C: Correct
Choice D: No. The singular pronoun it could refer to cuisine or foundation. Pronoun ambiguity.
Choice E: No. The phrase and, in addition is redundant. Redundancy.
The correct answer is choice C.