Solution:
(i) As per the question,
is a positive factor of a prime number 
Roster form,
and 
itself are the only possible positive factors of a prime number.
Hence,
or
As a result, 
Write the following sets in the roaster form: (i) C = {x | x is a positive factor of a prime number p}
Write the following sets in the roaster form: (i) C = {x | x is a positive factor of a prime number p}