Option 1: Only reflects sound - This option is not correct. A concrete wall does not act like a mirror for sound waves, simply reflecting them without any absorption or transmission.

Option 2: Only absorbs sound - This option is not correct either. While some types of walls or materials can be designed to absorb sound, a typical concrete wall does not have significant sound absorption properties.

Option 3: Only transmits sound - This option is also not correct. A concrete wall can indeed transmit sound to some extent, but it is not the only behavior of sound in contact with concrete.

Option 4: Absorbs and transmits sound - This option is correct. A concrete wall can both absorb and transmit sound. When sound waves come into contact with a concrete wall, some of the sound energy gets absorbed into the material, reducing the sound level in the surrounding area. Simultaneously, the remaining sound energy gets transmitted through the wall to the other side, potentially impacting the sound level in adjacent spaces.

In summary, while a concrete wall does have the capacity to absorb and transmit sound, it does not solely reflect sound or only absorb sound.