Prince Siddhartha of Kapilavastu toured his kingdom for four days, during which he saw people suffering from illness, old age, dead bodies, and grieving relatives, as well as a person deeply absorbed in meditation in a deserted place. After this four-day tour, Siddhartha realized—

• aPeople will be afflicted by disease, old age, and sickness
• bThe beauty of his beautiful wife will also fade
• cAll happiness lies in worldly life
• dThe inevitable outcome of human life