Step 1: Understanding the companies and their areas of operation.
- Ogilvy & Mather is a global advertising, marketing, and public relations agency, thus matching with Media Agency.
- Taylor Neilson Sofres specializes in market research, thus matching with Market Research Agency.
- Reliance MediaWorks is a media and entertainment company, fitting with Ad Agency.
- Mu Sigma is a data analytics firm, matching with Data Analytics firm.
Step 2: Analyzing the options.
(A) s-x; t-w; u-z; v-y: Correct, this is the correct match for each company and its corresponding specialization.
(B) s-w; t-y; u-x; v-z: Incorrect, the companies are mismatched with their respective specializations.
(C) s-z; t-y; u-x; v-z: Incorrect, this option contains incorrect pairings.
(D) s-x; t-z; u-w; v-y: Incorrect, some of the specializations are mismatched.
(E) None: Incorrect, as the correct answer is provided above.
Step 3: Conclusion.
The correct answer is (A) s-x; t-w; u-z; v-y, as these are the correct matches for the companies and their specializations.