Two beakers M and N of water were heated at different times with different burners. The graph shows the changes in the temperature of the water in beakers M and N.
Select the correct option regarding this activity.
(a) Water in beaker 'N' boils before the water in beaker 'M'.
(b) The water in beaker 'N' is heated with stronger flame.
(c) Water of both beakers reach the same temperature at 8.20 a.m.
(d) All of these.