What can a company understand from social media analytics?

Correct answer: Customer reactions and trends

The direct answer is option D, customer reactions and trends. Social media analytics means collecting and studying online data such as comments, likes, shares, reviews, searches, and discussion patterns. Step by step, the company observes what people say, measures repeated reactions, and identifies a rising or falling preference. This helps marketing, product improvement, and customer service. Option A, river water level, is an environmental or hydrological measurement and is not the normal purpose of customer social-media analysis. Option B, a map of parliament, is geographical or political information and is unrelated here. Option C, the number of factory bricks, is an internal physical inventory detail, not a customer trend. Option D is correct because social platforms reveal opinions, satisfaction, complaints, and changing interests. The data may not represent every customer perfectly, so it gives useful indications rather than absolute certainty. Exam cue: comments and online engagement point to customer feedback and trends.