What is the most common practiced religion in Japan?

a. Buddhism

b. Confucianism

c. Shinto

d. Taoism

The answer would (or is) A.)

According to surveys carried out in 2006 and 2008, less than 40% of the population of Japan identifies with an organized religion: around 35% are Buddhists, 3% to 4% are members of Shinto sects and derived religions, and from fewer than 1% to 2.3% are Christians.