GMAT sentence correction... The rule pertaining to none , all, most

All, most, none can be singular or plural depending on the countability of the nouns that follow.
They are singular when followed by non- countable nouns.
They are plural when followed by countable nouns.

Countable nouns
None of the invites have come.
None of the equipment has been shifted
None of our resources go to our consultants.
None of my friends have been eating food.

Non-Countable nouns
None of the money is spent

Grammar