Acube of limestone is slower to react in a beaker of acetic acid than the same amount of limestone in powder form. which is the best reason that the cube takes longer to react? . a. it is under greater pressure, which requires more energy to break bonds.. b. it is more concentrated, which causes fewer collisions of reactant molecules.. c. it has less surface area, which causes fewer collisions of reactant molecules. d. it has reactants with higher activation energies so it takes longer to break bonds.