Solution

There is presence of a sac like gland in cephalopods which is known as ink sac. This is also known as ink gland. This gland is located between the gills of the organisms. The gland releases ink like compound. The compound contains a dark pigment. When this compound is released into water, it helps the organism to move away from the predators. This is usually an escape mechanism.
Thus, the correct answer is option B.