A)1,300 B)866 434 D)2,166 5. What did many young people do to conserve the nature? A)They plant trees B)They build bridges across rivers in forests C) They cleaned the banks of ll kilometers of their river. D)All the aboveA) 1, 300 B) 866 C) 434 D) 2,166 5.What did many young people do to conserve the nature? A)They plant trees. B)They build bridges acrossriversin forests. C) They cleaned the banks of 11 kilometers of their river. D)All the above