Alexis wants to know which of these sentences is correct: 

None of the answers are correct. 

Although some sources say "none" is always singular, the modern consensus is that "none" can be singular or plural depending on your meaning. Ask whether you mean "not one" or "not any." If you mean "not one," "none" is singular. If you mean "not any," "none" is plural. 

None of the answers is correct. (means "not one of the answers is correct") 

None of the answers are correct. (means "not any of the answers are correct") 

(来源：英语杂志 http://www.EnglishCN.com)

When in doubt, treat "none" as singular.