According to Sabine's formula the reverberation time is
1
Directly proportional to volume of the auditorium and inversely proportional to absorption of different materials and speed of sound at room temperature.
2
Directly proportional to volume of the auditorium, absorption of different materials and speed of sound at room temperature.
3
Directly proportional to absorption of different materials and inversely proportional to volume of the auditorium, speed of sound at room temperature.
4
Inversely proportional to volume of the auditorium, absorption of different materials and speed of sound at room temperature.