When we increase the temperature of a reaction the
rate of reaction increases because of:
(i) Decreasing the potential energy of collision,
(ii) Increasing frequency of collisions,
(iii) Increasing kinetic energy of collision
$\begin{array}{1 1}(a)\;(i)\;only\\(b)\;(iii)\;only\\(c)\;(ii)\;and\;(iii)\\(d)\;(i),(ii),(iii)\end{array}$