Which word or words and punctuation best corrects any errors in the sentence?

we have relatives in tucson arizona portland maine and minneapolis minnesota.

a.
in: tucson, arizona, portland, maine; and minneapolis, minnesota

b.
in- tucson; arizona, portland; maine, and minneapolis; minnesota

c.
tucson, arizona; portland, maine; and minneapolis minnesota

d.
tucson, arizona; portland, maine; and minneapolis, minnesota