Three positive results of thinking before speaking and acting

Which of the following sentences below uses the simplest and clearest language? a. library cards are not too hard to get, but they aren't too easy to get either. b. some libraries have a lot of rules to follow for filling out the forms. c. library cards make it possible to read books all year long. d. once you get the application, you can figure it out.

Based on your knowledge of word parts what does the word intervene mean

The balance includes both the fees for service and the shipping charges. is this sentence incomplete or complete?