The website likely contains reliable information if the website is referred to by other websites (A).
If a website is often referred to by other websites, it is likely it contains reliable information, because the chances of other websites wanting to share the same unreliable information is slim.
The reasons the other choices are likely to be less reliable include:
- If a website has many contributors, there is a higher chance that some of the information presented is incorrect because people are able to edit information to suit their needs.
- While .orgs used to be used primarily for non-profits, they can be purchased by anyone trying to promote their agenda.
- Just because a website has professional-looking graphics, doesn't mean the information is reliable. It could just be a method to make you think that it is.