The degree to which genes contribute to Krabbe disease compared to osteoporosis is that

A)Krabbe disease is caused by small contributions from many genes,with no environmental component.
B)Krabbe disease and osteoporosis are caused by mutations in different single genes.
C)Krabbe disease and osteoporosis are caused by a mutation in the same single gene,but it acts early in life in Krabbe disease and later in life in osteoporosis.
D)Krabbe disease is genetic and osteoporosis is caused entirely by environmental factors,such as lack of weight-bearing exercise and a diet poor in calcium and vitamin D.
E)Krabbe disease is very rare and caused by a mutation in a single gene,whereas osteoporosis is caused by several genes and environmental factors