Search engines enable you to:

A. talk to people via the computer.

B. locate Web pages related to a specific subject.

C. connect to a better ISP.

D. find and replace a certain item in Word.

B. locate Web pages related to a specific subject.

Not A because currently no search engine has an in-built option to talk to other people, and even if it did it wouldn't be it's core functionality.

Not C, as there is no way to change ISP (internet service provider) using your search engine.

Not D as search engines have no connection to MS Word.