Introduction:
The three pigs are well-known characters from the popular fairy tale "The Three Little Pigs." In the story, each pig builds their own house using different materials - straw, sticks, and bricks. However, one material that is not used by any of the pigs is ice.

Explanation:
The three pigs in the story use various materials to construct their houses, each with different outcomes in terms of strength and durability.

1. Straw:
One of the pigs decides to build their house out of straw. This material is weak and easily blown away by the wolf in the story. It represents a hasty and careless choice for construction.

2. Sticks:
Another pig chooses to build their house using sticks. Although sticks are stronger than straw, they are still not sturdy enough to withstand the wolf's attacks. This material choice symbolizes a slightly better but still inadequate effort in building a secure home.

3. Bricks:
The third pig, being the most prudent and responsible, constructs their house using bricks. Bricks are a strong and durable material, making the house nearly indestructible. This choice demonstrates the importance of investing time and effort in building a reliable and safe structure.

4. Ice:
The option "c) Ice" is the correct answer as it is not one of the materials used by any of the three pigs. Ice is not a practical choice for constructing a house as it is too fragile and can easily melt or break. It does not provide the necessary stability or protection required for a dwelling.

Conclusion:
In the story of "The Three Little Pigs," the pigs use straw, sticks, and bricks to build their houses. While straw and sticks represent poor material choices that result in vulnerability, the use of bricks symbolizes a solid and secure structure. Ice, on the other hand, is not used by any of the pigs due to its unsuitability for house construction.