I would go with C but i am not 100 percent on that
Answer:
They communicate ideas very quickly.
Explanation:
I say the answers is A but if you mean ventilation in the area of the room then answer B
Answer:
Bluray
DVD
CD
Explanation:
Blu ray can hold 25gb per layer
Dvd can hold 4.7GB on a single layer
Cd can hold around 737 mb
Also, dvds can go up to 2 layers
Blu ray can go up to 4
both b and c are the right