Hello Stacey,
I am following the Manhattan SC 2007 Edition Book for Sentence Correction Concepts. The book, in Chapter - 2, mentions SANAM pronous that can be both Singular and Plural depending on the context of the sentence. The book suggests that we need to look at the "of" construction and check the number of the subject.
for eg
Some of the money WAS stolen
Some of the documents WERE stolen.
Now, this includes NONE also. But when I consult OG, I can see that NONE is treated as Singular irrespective of the context of the sentence.
Please have a look at the SC question no 17 from OG 11. it says
None of the attempts to specify the causes of the crime explains .........
Because this is the portion of the sentence which is NOT underlined, I can assume that there are no errors here.
Now "explains" makes "attempts" singular which according to the book MUST be plural in this context.
Please Help !!!