Based on global estimates of water supply and sanitation investment, which of the following is true?

Answer Options:

a. Water supply is $100 invested and $2.00 return, while sanitation is $1 invested with $5.50 returned.

b. Water supply is $1.00 invested and $2.00 return, while sanitation is $5.50 invested with $5.50 returned.

c. Water supply is $1.00 invested and $2.00 return, while sanitation is $1 invested with $5.50 returned.

d. Water supply is $2.00 invested and $1.00 return, while sanitation is $1 invested with $5.50 returned.