As the Marketing Manager for a State-Wide Chain of Sub

As the marketing manager for a state-wide chain of sub sandwich shops, you're growing increasingly concerned by the decline in sales over the last two years. Vague rumors have filtered up through store managers that customers are unhappy with everything from the menu to the ingredients to the sales associates, but you have no idea how to identify the real problems. You can think of several ways to use social media to resolve this specific issue, but which one is the least likely to be useful?

A) Setting up a Facebook page where you can interact with consumers.
B) Purchasing ads that invite consumers to answer a quick, five-question online survey about your products and services in exchange for a $2.00-off coupon toward their next purchase.
C) Hiring a marketing agency to create a social media campaign that's engaging and compelling.
D) Using the search function built into most social media channels to find and read conversations about your brand.