Torpedo or electric ray has electric organs that are used to generate electric shock to paralyze the prey.
Bony fishes use all the 5 kinds of fins for swimming.
Amphibians do have moist skin but they do not have scales on their body.
Birds are homeothermic and not poikilothermic because they can maintain temperature by homeostasis.
All mammals produce milk from mammary glands to nourish their young ones.
So the correct answer is option "B"
('a, b and e are true, c and d are false.' )