The given graph is a representation of kinetics of a reaction. The $y$ and $x$ axes for zero and first order reactions,respectively are

• A
  zero order ($y=$ concentration and $x=$ time),first order ($y=$ rate constant and $x=$ concentration)
• B
  zero order ($y=$ rate and $x=$ concentration),first order ($y=t_{1/2}$ and $x=$ concentration)
• C
  zero order ($y=$ rate and $x=$ concentration),first order ($y=$ rate and $x=t_{1/2}$)
• D
  zero order ($y=$ concentration and $x=$ time),first order ($y=t_{1/2}$ and $x=$ concentration)