A. the promotion which needs to the simplest rule (involves the fewest products) will consume the product, so further promotions cannot be applied

B. this can not happen. Multiple promotions can not be configured to compete the same product (Comment
- possible can be configured.)

C. the promotion with the higher priority will consume the product, so further promotions can not be applied (Comment - as per wiki this should be right. But I created two 'Buy Product A and get B' promotions both are applying together and created one more promotion 'Buy X and get Y' and this promotion is stopping other two promotions if I set it to high priority.Confused!!)

D. both promotions will be applied to that product