This is what came up for that: https://www.google.com/search?q=mother+cinquain+poem&tbm=isch&source=univ&hl=en-us&client=safari&sa=X&ved=2ahUKEwjm2PCb5IXnAhWFMX0KHahQDS8QsAR6BAgJEAE&biw=1112&bih=712
The sentence does not contain any errors in period usage is letter (A)<span> Have you read The Hobbit by J. R. R. Tolkien? Letter B is lacking a period after 'Lt'. Letter C lacks period after 'Rev' and letter D lacks a period right after the word 'Sgt.' As much as possible, contracted titles should have periods right after it.</span>