During the Signal Transduction Process, the Signal Often Triggers a Signal

During the signal transduction process, the signal often triggers a signal transduction cascade. For example, an activated receptor activates hundreds of protein A. Each activated protein A activates hundreds of protein B and so on until a cellular response occurs. What purpose does this cascade serve?

A) Having several intermediates allows for greater control of the response.
B) The cascade serves to amplify the signal, so one activated receptor can have a significant response.
C) Having a cascade allows the cell to respond to different signals.
D) The cascade makes signaling easier to shut off or terminate.