Which 3 reasons explain why these Products failed to create Opportunity Products?

An Admin is working on a primary Quote attached to an Opportunity. The Pricebook & currency on the Quote & opportunity match. However, not all products from the Quote are being transferred to the opportunity, & no error message is displayed .

Which 3 reasons explain why these Products failed to create Opportunity Products? Choose 3 answers.
A . “Exclude from Opportunity” is marked on the Product record.
B . Products with a Price of zero do not transfer to the Opportunity.
C . No valid pricebook entry can be found for these products.
D . Validation Rules on the Opportunity product silently fail.
E . Products with an effective quantity of zero do not transfer to the opportunity.

Answer: A,D