Which of the Following Is Placed in the Correct Order

Which of the following is placed in the correct order of increasing complexity?

A) circulatory system→cardiac muscle→heart→cardiac cell
B) circulatory system→heart→cardiac muscle→cardiac cell
C) cardiac cell→heart→cardiac muscle→circulatory system
D) cardiac cell→cardiac muscle→heart→circulatory system
E) Cardiac cell→heart→cardiac muscle→circulatory system