Final answer:
Mount Fuji is sacred to the followers of Shintoism, the traditional religion of Japan which is focused on the kami spirits inherently present in nature. Option a.
Step-by-step explanation:
Mount Fuji, depicted in Hokusai's print The Great Wave off Shore at Kanagawa, is sacred to followers of Shintoism. Shintoism, the traditional religion of Japan, recognizes spirits known as kami in various elements of nature.
Shinto shrines in Japan, sometimes found in locations with strong connections to the kami like mountains, forests, waterfalls, and other sacred places, are marked by torii gates.
The backdrop of the majestic Mount Fuji in this and other works within the 36 Views of Mount Fuji series draws a connection between the art and the religious significance of the mountain in Shinto belief.
So Option a.