Question

Which of the following renewable sources of energy are needed to be developed to contribute the traditional sources of energy ?
(a) Bio - gas
(b) Solar energy
(c) Solid wastes
(d) Wind
Answer options :
(1) (a), (c) (d)
(2) (a), (b), (c)
(3) (b), (c), (d)
(4) All of the above

Answer 1

all the above options are correct