To the frustration of Hispanic publishers, advertising agencies often treat Spanish language or bilingual newspapers as ________in their marketing plans.
句意：令西班牙语出版商沮丧的是，广告公司往往把西班牙语或双语报纸作为其营销计划中的干扰。afterthought回想。advantage优势。disturbance干扰。penetration 渗透。因此，本题的正确答案为C。