Which of the Statements Is Incorrect Regarding the Similarities and Differences

Which of the statements is incorrect regarding the similarities and differences between the cardiovascular and lymphatic systems?

A) Although the cardiovascular and lymphatic systems run virtually parallel to each other,blood and lymphatic fluid never mixes.
B) Both the cardiovascular system and the lymphatic system comprise a series of vessels that run roughly parallel to each other.
C) The cardiovascular system is a closed circuit,whereas the lymphatic system directs fluid in one direction only.
D) The cardiovascular system has a pump (the heart) to circulate blood,whereas the lymphatic system has no pumping mechanism.