Final answer:
The correct option is: C) resilient channel. The most effective, lowest cost method of reducing sound transmission when installing drywall is using a resilient channel. It helps to decouple the drywall from the studs, reducing sound vibrations that can travel through the wall.
Step-by-step explanation:
The most effective, lowest cost method of reducing sound transmission when installing drywall is resilient channel. A resilient channel is a thin metal channel that is attached to the wall studs before installing drywall. It helps to decouple the drywall from the studs, reducing sound vibrations that can travel through the wall.
The correct option is: C) resilient channel. The most effective, lowest cost method of reducing sound transmission when installing drywall is using a resilient channel. It helps to decouple the drywall from the studs, reducing sound vibrations that can travel through the wall.