4. (8 points) The weight of 1 pig is equal to the weight of 6 chickens; the weight of 3 chickens is equal to the weight of 4 ducks; the weight of 2 ducks is equal to the weight of 6 fish. Therefore, the weight of 2 pigs is equal to ( ) fish.
A. 48
B. 36
C. 24
D. 18
【Answer】Solution: $6 \div 3 \times 4$
$$
\begin{array}{l}
=2 \times 4 \\
=8 \text { (pigs) } \\
8 \div 2 \times 6 \\
=4 \times 6 \\
=24 \text { (fish) } \\
24 \times 2=48 \text { (fish) }
\end{array}
$$

Answer: The weight of 2 piglets is equal to the weight of 48 fish. Therefore, the correct choice is: A.