What happens when activation energy increases

As the temperature increases, the molecules move faster and therefore collide more frequently. The molecules also carry more kinetic energy. Thus, the proportion of collisions that can overcome the activation energy for the reaction increases with temperature.

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its either a or c

Explanation:

i put a, but it could be a because the more of a reactant there is, the more collosions happen, but it could also be c because the reaction rate is in fact lowered