Answer: option A) adequacy
Explanation:
Definitely, ACK has an healthy diet missing ADEQUACY of energy provision. This is seen in the shortfall of 1200 kilocalories of energy (2800 - 1600 = 1200).
Note that Ack feed on varieties of food, thus he gets balanced diet, and a variety diet. However, he is short of 1200 kilocalories, thus making him miss ADEQUACY