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.

Fine out your self ponk

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf