50 ! brainliest if

which is usually associated with a faster reaction rate?
a. adding heat energy to the reactants
b. putting a glass cover over the reactants
c. using a solid with a low surface area in the reactants
d. decreasing the concentration of a solution of the reactants

A is the answer because the others don't make sense. B if you put glass over reactants it doesn't change anything in the reaction. C using a solid with a low surface area will actually be doing the opposite, a higher SA will increase the rate of reaction. D decreasing the concentration will decrease the reaction

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.