The correct answer is: Only assumption I is implicit.
The statement “Read this notice before entering the club” does not imply that no blind person comes to the club. It is possible that the club has made arrangements for blind people to access the notice in a different way, such as by providing an audio recording or a Braille version.
The statement does, however, imply that people are expected to be able to read the notice. This is because the notice is being used as a way of communicating information to club members, and it is assumed that club members will be able to understand the information that is being communicated.
Therefore, only assumption I is implicit in the statement.