What Practice Is Associated with the Daoist Concept of Qigong

What practice is associated with the Daoist concept of qigong?

A) The ceremony of preparing and pouring tea
B) Ingesting poisonous substances such as cinnabar to achieve immortality
C) Repeatedly chanting Daoist mantras in the evening
D) Slow-motion movements that encourage tranquility
E) Breathing exercises that help the movement of vital energy through the body