1. What 2 ETFs are least efficient

2. What is the least risky ETF

ETF Price 4/30/2020 100 100 100 100 100 A B C Price 4/30/2021 144 103 110 Dividend paid $0 $0 $0 $3 $1 12-month total return 44% 3% Annual risk Correlation with (STDEV) ETF A 32% +100% 4% - 16% 27% +65% 15% +76% 17% +71% 10% D 112 15% E 109 10%