Which of the following is/are useful effort(s) for sustainability of resources?
- a. Switching off unnecessary lights and fans
- b. Using lift instead of stairs
- c. Repairing leaking taps for conserving water
- d. Using empty containers to store things
- e. Going to school by your own car instead of cycling
A1, 3
B1, 3, 4
C3, 5
D3 only