Analyzing the given animals for common characteristics:
(A) Dog - Mammal, four-legged vertebrate
(B) Cow - Mammal, four-legged vertebrate
(C) Elephant - Mammal, four-legged vertebrate
(D) Crow - Bird, two-legged vertebrate
The similarity pattern that connects three animals:
Dog, Cow, and Elephant are all mammals with four legs (quadrupeds).
Crow is a bird with two legs and wings, making it fundamentally different from the other three.
Option 4 includes (B), (C) and (A) which represents Cow, Elephant, and Dog.
These three share the common characteristics of being:
- Mammals
- Four-legged animals
- Land vertebrates with similar body structure
Therefore, the correct answer is Option 4: (B), (C) and (A) only.