Which service will help a marketing manager analyze sentiment about a new brand?

The service that will help a marketing manager analyze sentiment about a new brand is Natural Language Understanding (Sentiment). This tool is specifically designed to interpret and gauge the emotional tone behind a series of words, allowing users to identify whether the sentiment expressed is positive, negative, or neutral. With this functionality, marketing managers can effectively assess public opinion and sentiment surrounding their brand, facilitating informed decision-making and targeted strategies.

Other services mentioned, such as Discovery, may focus more on data mining and insights extraction from unstructured data rather than sentiment analysis. Natural Language Understanding (Keywords) is similar but is primarily concerned with identifying key concepts or terms in text, not with assessing sentiment. Personality Insights, while valuable for understanding demographic personality traits and preferences, also does not focus directly on sentiment analysis of a brand or product. Hence, the Natural Language Understanding (Sentiment) service is specifically tailored for evaluating brand sentiment, making it the correct choice for this case.