Answer:
If this is MLA style, then it's B. The book's title is first instead of second.
In Dulce et Decorum Est, hags is used to describe young soldiers. The simile 'coughing like hags' was used because the young soldiers went into battle strong and full of life. After battle, they returned looking aged and beat down - hence 'hags' or resembling beggars.
because doctor help save lives and teacher is there just to teach each of its own
Because is the correct answer. The word because is connecting the two statements together and explaining how they finished their work.
A statement of the author’s purpose in writing the book, which may include suggestions for using the book
