Which of the following is due to global warming?
(i) An increase in the water level in the sea
(ii) The melting of snow on mountain peaks
(iii) A decrease in food production by plants
(a) Only (i) and (ii)
(b) Only (ii) and (iii)
(c) Only (i) and (iii)
(d) (i), (ii) and (iii)