Which graph represents zero-order reaction `[A(g) rarr B (g)]` ?

Which curve represents zero order reaction:

Which of the following graphs represents zero order if A rarr P At t = 0 rArr [A]_(0) At t = t rArr [A]_(t)

Which of the following graphs represents zero order if A rarr P At t = 0 rArr [A]_(0) At t = t rArr [A]_(t)

Which of the following curve represent zero order reaction of A rarr products ?

Which of the following graphs represents a zero order reaction ? (a = initial concentration of reactant, x = concentration of reactant consumed, t= time)

The plot that represents the zero order reaction is:

Which of the following graphs represents a first order reaction ?