If a consumer buys a product that costs Rs.3 and provides an additional 18 units of satisfaction, then for this purchase:

A. Total utility will increase by 6 units

B. The marginal utility per rupee is 6

C. The consumer will buy more because marginal utility is positive

D. The consumer obtained an extra54 units

Please do not use chat terms. Example: avoid using "grt" instead of "great".