A The boy’s grandma, an incredibly kind woman, always bought him chocolate, cakes and a nice fresh apple.
B The boys’ grandma, an incredibly kind woman, always bought him chocolate, cakes, and a nice fresh apple.
C The boys’ grandma, an incredibly kind woman, always bought him: chocolate, cakes, a nice fresh apple.
D The boy’s grandma, an incredibly kind woman always bought him: chocolate, cakes, and a nice fresh apple.
E The boy’s grandma, an incredibly kind woman always bought him: chocolate; cakes; and a nice fresh apple.