When we say that communication is intentional, it means that

Saying communication is intentional means the sender consciously intends to affect the behaviour of the receiver of the message.

Intentionality points to purpose, a deliberate aim to shape the receiver's thought or action.

Describing effective communication as a process of acting on information states a different idea about outcomes, not about intent.

Saying that through speech people make sense of the world describes communication's meaning-making role, not its intentional character.

The rejection of every listed idea does not apply, since one statement does capture intentionality.

The defining mark of intentional communication is the sender's conscious purpose to influence.