How fast a reactant is used up to how fast a product is formed is a)the equilibrium b) the rate of reaction c) solution concentration d) the catalyst

  B) The rate of reaction

Explanation:  Rate of reaction describes the speed at which the reactants of the reaction are getting converted into the products with respect to time.

The equilibrium explains that how much concentration of reactant is in equilibrium with the product.

Solution concentration is the number of moles of solution divided by volume.

The catalyst is the substance which increases the rate of the reaction which bringing any change in other things.

the answer would be b i believe