Which of the following statements are true about biodiversity conservation in the world?
A. Efforts should be made to preserve the species that are endangered.
B. International trade in wild plants should be without restrictions.
C. Each country should identify habitats of wild animals for protection.
D. Such sites where species feed, breed and nurse their youngs, should be protected.
E. Keystone species should be removed from eco-systems.
Choose the correct answer from the options given below: 1. A, B and C only 2. B, C and D only 3. C. D and E only 4. A, C and D only