Social Media Are Presenting Marketers with Challenges as Well as Opportunities.Which

Social media are presenting marketers with challenges as well as opportunities.Which of the following uses of social media can pose problems?

A) Consumers posting queries on companies' Facebook pages
B) Consumers posting and sharing complaints about services
C) Companies providing accurate information quickly
D) Companies replying to customers' tweets instead of staffing a call centre
E) Consumers seeking information about products, services and brands