It turns out that the author made a mistake.

Mainly invested in stock funds and bond funds, and the ratio of stock and bond investment to net asset value is:

a:80% 90% B:70% 80% C:60% 70% D:50% 60%

This is the answer.

Then it should be between a and b, and major investment should account for a relatively large proportion. So it's the same as I chose a on the first floor.

Adopt me!