Which one of the following inhibits seed germination for a particular period?(a) light (b) water(c) co2 (d)dormancy

A dormant seed is one that is unable to germinate in a specified period of time under a combination of environmental factors that are normally suitable for the germination of the non-dormant seed. Dormancy is a mechanism to prevent germination during unsuitable ecological conditions, when the probability of seedling survival is low. Therefore, option (d) is correct.