The correct option is A It will lead to decrease in respiration rate
Cyanide, azides, dinitrophenol, carbon monoxide, rotenone, antimycin are few of the chemicals that capable of slowing down the rate of respiration. These chemicals inhibit respiratory enzymes such as cytochrome complexes. They bind to active sites and stop the functioning of enzymes. For example, carbon monoxide binds to cytochrome c oxidase and inactivates the enzyme.