Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

With respect to an investor’s utility function expressed as: , which of the following values for the measure for risk aversion has the least amount of risk aversion?
Option A:-4.
Option B:0.
Option C:4.

Answer: A