What system is responsible for the transportation of blood throught the system?

a: respiratoy
b: circulatory
c: digestive
d: endocrine

The question may be incomplete (there are not the possible answers), but according to the scenario, kaley and her coworkers could be in a humanitarian organization like red cross (in the us or in other countries). it's an organization which organizes health and safety services, disaster services, and blood donations.

What is the question for this problem

The answer is c. the occurrence of anxiety attacks because circadian rhythm means an biological  process that displays anxiety. i hope i .