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Theconcentrationof the reactantsdecreaseswhich causes the reactionrateto decrease as the reaction progresses and the correct option isoption A.What is Rate of a Reaction?The rate of reaction refers to thespeedat which the products are formed from the reactants in a chemical reaction.The rate or speed of reaction can be defined as the change in the concentration of any one of thereactants or productsper unit time.Rate of reaction is affected by a change in concentration.The chemical reaction rateincreaseswith the increase in concentration and decreases with thedecreasein the concentration of reactants.Therefore, Theconcentrationof the reactantsdecreaseswhich causes the reactionrateto decrease as the reaction progresses and the correct option isoption A.Learn more aboutRate of reaction, here:brainly.com/question/30546888#SPJ3...