Answer: B. Internet connection speed
Internet speeds vary for many reasons and they won't have an impact on whether a source is credible or not. Instead, you should look at the domain name, the website name, the author, etc to check credibility. You should also get as many sources as you can to back up a claim.
Answer:
The answer is B) Crusaders returned to Europe with new ideas
B. A group of ideas or tenants of democracy
