Answer:
B
Step-by-step explanation:
The circulatory systems main function is to transport blood throughout the body. Within this blood lies oxygen, nutrients and hormones. As well as a form of transportation for these things the circulatory system removes waste products like carbon dioxide.
The circulatory system transports nutrients and hormones rather than making them so neither A or D would be the answer.
Your reflexes are created via the nervous system so C is not the answer.
The answer is B transports hormones