Which is a correctly written sentence, not a run-on?
a. the ferry leaves for the island in fifteen minutes; we need to hurry to catch it.
b. the library has a good selection of books and movies we borrow some every week.
c. the train left the station at 3 o'clock it should be arriving in town any minute now.
d. the summer concert series in the park starts thursday we plan on going every week.
