A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm) in a sheet of paper. The reason will be

• A

  Because the hole produces an image of the letters at a longer distance  

• B

  Because in doing so, the focal length of the eye lens is effectively increased  

• C

  Because in doing so, the focal length of the eye lens is effectively decreased

• D

  None of these