Answer:
B. Search engine
Step-by-step explanation:
Search engine is a program that internet users uses in getting information from the world wide web on what is been searched for. The search engine uses key words from the search to locate websites where information concerning the subject could be found. Common examples of search engines includes Yahoo, Google and bing. By inputting "ty cobb" on his computer and getting back over 30 websites containing information on ty Cobb, Robert must have used a search engine.