For the following graphs, 

Choose from the option given below, the correct one regarding order of reaction is

 

For zero order reaction's

$\text{ rate }=\mathrm{K}[\text{ Reactant }{]}^0$

r = k

${\mathrm{t}}_{1/2}=\frac{[A{]}_0}{2k}\text{ for zero order }$

For first order reaction → 

r = K [Concentration]

Reactant concentration after time t →

$C_t=C_0{e}^{-kt}$