Answer: All of the above.
D in the morning, during this time you have been inactive for the past (hopefully) 8-9 hours or else you will be sleep deprived and your body is not at its 100%. Sleep deprivation could cause many disadvantages to your morning exercise and the day ahead. The most important is to start well rested and get at it with good stretching exercises and you will give your best to a better you. The hardest part about exercising in the morning is the mental battle that you will face with your "lazy self". The "lazy self" will keep pushing you to sleep more or eat that wonderful slice of cake from breakfast but you need to be able to battle this mental state and push towards a better you that only thinks of a healthier state.
The answer is true.
Initially a person enjoys the physical and emotional response, as time goes on they need more of the drug just to feel "normal". They are always seeking the same feeling as the first high.
The answer is source B because it has a listed author who is an expert and it is the governments organization website which are more reliable that a .com website. Source A does not even list the author so you do not know who wrote it could be anyone.
I believe that the answer would be D., Water.
Water gives you alot of energy, believe it or not. If you
were not to drink water for days, you will feel very lazy
and down.
Hope this helps!