Which of the following changes generally lead to greater reaction rates?

Question

(I)Increasing the temperature
(II)Decreasing the concentration of a reactant
or
(III) adding a catalyst

I know that change in temperature influences the reaction, in this case it speeds up and that adding a catalyst speeds one up too.

Is the question asking for which ones speed it up?? Is that what it means by GREATER?

Answer 1

This is based on the Collision theory.