Which of the following factors does NOT affect the transmission of sound from one room to another?

The correct answer indicates that the size of the room does not directly influence the transmission of sound from one room to another. The transmission of sound primarily depends on how barriers such as walls, floors, and ceilings interact with sound waves.

Factors that affect sound transmission include the thickness of the wall, which can impact how much sound is absorbed or blocked; the area of the wall, which can determine how much sound can pass through; and the material of the wall, as different materials have varying levels of sound absorption and transmission.

In contrast, while the size of a room might influence the overall acoustics within that space—for example, larger rooms may have different reverberation characteristics—it does not directly affect how sound travels from one room into another. This is why the size of the room is the correct answer to indicate that it does not influence sound transmission between separate rooms.