Which of these factors force the depletion of the world's natural resources?
(i) An increase in the human population.
(ii) The larger number of vehicles in use.
(iii) The greater use of biodegradable products.
(iv) More electrical appliances being used to make work easier.
(B) (i), (ii) & (iv)
(C) (ii) & (iv)
(D) (ii), (iii) & (iv).