能再解释一下吗？

问题如下：

Julie Carlisle is a financial planner at a large wealth management firm. One of her clients, Esteban Blake, just received a sizable inheritance. He invests a portion of the inheritance in an annuity that will immediately increase his income by a substantial amount.

Holding all else constant, the change in Blake’s income will most likely result in:

选项：

A.

an increase in his marginal utility of consumption.

B.

an increase in his inter-temporal rate of substitution.

C.

a decrease in his required risk premium for investing in risky assets.

解释：

The additional annuity payment substantially increases Blake’s income and wealth, which decreases his marginal utility of consumption. As a result, the average loss of marginal utility from any risk taking decreases as his wealth increases. Thus, he requires a lower risk premium and is willing to buy more risky assets.