Familiarize oneself with the types of jobs most often available, with the various employment offices, and with the skills most in demand.

what correction should be made?

a)change Familiarize to Familiarized
b)replace oneself with yourself
c)insert a comma after various
d)change offices to office
e)chnage demand to demanding

B.) replace oneself with yourself

The correction that should be made is:

d) change "offices" to "office"

The sentence should read: "Familiarize yourself with the types of jobs most often available, with the various employment office, and with the skills most in demand."