Answer:
A. Zen Buddhism
Step-by-step explanation:
Zen Buddhism advocated the followers that in order to reach state of enlightenment, people need to dedicate themselves to fully control themselves from worldly desire and fully polish their mind and body. This sect was widely popular among the warrior class In Japan.
Meditation is the act that they can do to polish the mind while martial arts are the act that they can do to polish the body. Compared to other sect of Buddhism, Zen Buddhism has a more direct benefit/implementation tot he followers' day to day life.