Final answer:
The unique address for each web page is known as a URL (Uniform Resource Locator). It is used to locate and retrieve pages on the Internet.
Step-by-step explanation:
Each Web page has a unique address, which distinguishes it from all other pages on the Internet. The correct answer is B) URL. URL stands for Uniform Resource Locator and it is the address of a resource on the Internet. It indicates the location of a web page and is used to retrieve it from web servers. Unlike a DOI which is a permanent identifier used to locate an online source such as a journal article, a URL may change over time but is the address used for locating web pages.