You have abandoned ship and are in an inflatable raft that has just inflated. You hear a continuous hissing coming from a fitting in a buoyancy tube. What is the cause of this?

A
The saltwater is activating the batteries of the marker lights on the canopy.
B
The inflation pump is in automatic operation to keep the tubes fully inflated.
C
A deflation plug is partially open allowing the escape of CO2.
D
Excess inflation pressure is bleeding off and should soon stop.
E