D. The incentive approach and then the drive-reduction approach
The class of nutrient that is necessary for production is D. FAT
They are both highly selective,most of the time what binds to them. Think of it as a lock and key, if the key fits the lock and it turns then it does what it needs.
B. Carrot
Apple and grapes belong to the fruit food group.
Breadsticks belong to the grain food group.
Hope this helps, best of luck to you. :)
