Which of the following is not an example of a bio-mass energy source?

Which of the following is not an example of a biomass energy source ?

Which of the following is not an example of a biomass energy source ?

Which of the following is not an example of bio-mass energy source ? (a) wood (b) gobar gas ( c) atomic energy (d) coal.

Which of the following is not an example of bio-mass energy source ? (a) wood (b) gobar gas ( c) atomic energy (d) coal.