pls answe asap

Given the following reaction: 2NH3(g)N2(g)+3H2(g) Which of the following relates the rate of production of H2 to the rate of consumption of NH3 ? rate of production of H2=+1/2(NH3/t) rate of production of H2=1/2(NH3/t) rate of production of H2=+3/2(NH3/t) rate of production of H2=3/2(NH3/t) rate of production of H2=+2/3(NH3/t) rate of production of H2=2/3(NH3/t)