A risk-averse person has_______.

a. a utility function whose slope gets flatter as wealth rises. This means they have increasing marginal utility of wealth.
b. a utility function whose slope gets flatter as wealth rises. This means they have diminishing marginal utility of wealth.
c. a utility function whose slope gets steeper as wealth rises. This means they have increasing marginal utility of wealth.
d. a utility function whose slope gets steeper as wealth rises. This means they have diminishing utility of wealth.