Which sentence is expressed correctly?

Question $5$ options:

a$)$

Three reasons that people blog are to $1,$ express themselves creatively, $2,$ share personal experiences with others, and $3,$ stay in touch with family and friends.

b$)$

Three reasons that people blog are to $($a$)$ express themselves creatively, $($b$)$ share personal experiences with others, and $($c$)$ stay in touch with family and friends.

c$)$

Three reasons that people blog are to: $($a$)$ express themselves creatively, $($b$)$ share personal experiences with others, and $($c$)$ stay in touch with family and friends.