When obtaining information on the Internet, which ending for a URL is probably not as reliable as the others?

.com

Explanation:

When evaluating a website there are several things to take into consideration, one of the first things to look at is the URL (Uniform Resource Locator: a protocol for specifying addresses on the Internet) this can often tell you several things about the website, the creator, the audience, the purpose and sometimes even the country of origin. The domain suffix might also give you a clue about the geographic origin of a web site, each country also has a unique domain suffix that is meant to be used for websites within the country.

.com = Commercial site. The information provided by commercial interests is generally going to shed a positive light on the product it promotes. While this information might not necessarily be false, you might be getting only part of the picture. Remember, there's a monetary incentive behind every commercial site in providing you with information, whether it is for good public relations or to sell you a product outright.