Information about Three investments as below Years Probability

Years 1, 2, 3, 4, 5

Probability 0.1, 0.2, 0.35, 0.2, 0.15

Investment A 300, 350, 280, 460, 500

Investment B 850, 560, 450, 680, 700

Investment C 500, 600, 700, 800, 900

If the investor wants to invest in any two of the above investments equally, which combination of two investments you select based on the portfolio risk?

Please provide full explanation