Which of these statements is about reaction rate is accurate
a. all chemical reactions occur at a fast rate.
b. all chemical reactions occur at a slow rate.
c. all chemical reactions occur at different rates.
d. all chemical reactions occur at the same rate.

I am pretty sure that the statement which is about reaction rate is accurate is C. All chemical reactions occur at different rates. I bet you will agree with me if I provide m y answer with some examples : cooking food is a chemical reaction indeed;  which means that some food can be made faster or slower than other ones. 
See?  I bet it's clear! 
Regards.

C.
All chemical reactions occur at different rates, defined by their rate equation.

Ci think not