What is the most common practiced religion in Japan?

a. Buddhism

b. Confucianism

c. Shinto

d. Taoism

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.

The answer would (or is) A.)