a	b	c
expected return	15%	30%	80%
variance	5%	7%	12%

If there are three investments A, B and C: A B C Expected return 15% 30% 80% Variance 5% 7% 12% If you can only choose one investment, which one is your choice and why? You can answer this question based on your own risk preference. And there is no need to do calculations for this question.