In which of the following reactions the graph of concentration vs time for reactants and products will be difficult to plot.
A. `N_(2)O_(5)(g)rarr2NO_(2)(g)+(1)/(2)O_(2)(g)`
B. `CH_(3)overset(O)overset(||)C-OCH_(3)(aq)overset([H^(+)])rarrCH_(3)overset(O)overset(||)C-OH+CH_(3)OH`
C. `H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l)`
D. `H_(2)O_(2)(aq)rarrH_(2)O(l)+(1)/(2)O_(2)(g)`
