Question

how does increasing temperature increase the rate of a reaction?
lowering the $e_a$
lowering the $delta h$
increasing the proportion of molecules with sufficient energy, the $delta h$
increasing the frequency of collisions and the proportion of molecules with sufficient energy, the $e_a$

Explanation:

Increasing temperature makes molecules move faster, increasing collision frequency. It also provides more kinetic energy to molecules, increasing the proportion of molecules with enough energy (equal to or greater than the activation energy $E_a$) to react. Lowering $E_a$ is usually due to catalysts, and $\Delta H$ (enthalpy change) is a characteristic of the reaction itself and not directly affected by temperature in terms of being lowered by temperature increase for the purpose of speeding up the reaction.

Answer:

D. Increasing the frequency of collisions and the proportion of molecules with sufficient energy, the $E_a$