According to law of diminishing marginal utility, the longer that Lee and Chris kiss: (i) the less invested each will be in ongoing this relationship. (ii) The nearer they are to reaching their joined production possibilities frontier. (iii) The more utility Chris makes for Lee. (iv) After some point, each of them will take pleasure in each additional kiss less and less. (5) The more probable it is that Lee and Chris will get married.
Please someone suggest me the right answer.