The Necessary Part of the Word "Saddle"

Explanation:
When identifying the necessary part of the word "saddle," we need to determine what is an essential component or element of a saddle.

A saddle is an item used for riding horses, and it consists of various parts that contribute to its functionality and comfort. A saddle provides support and balance to the rider while ensuring the horse's comfort.

Key Points:
To find the necessary part of the word "saddle," we can consider the following components:

1. Horse: While a horse is essential for riding, it is not a necessary part of the saddle itself. Therefore, option A can be eliminated.

2. Seat: The seat is the part of the saddle where the rider sits. It is an essential component as it provides a comfortable and secure position for the rider. Without a seat, the saddle would not serve its purpose effectively. Therefore, option B is the correct answer.

3. Stirrups: Stirrups are the metal or wooden loops attached to the saddle, which provide support for the rider's feet. Although they play a significant role in maintaining balance and stability, stirrups are not a necessary part of the saddle itself. Therefore, option C is incorrect.

4. Horn: The horn is a protrusion located at the front of the saddle, primarily used for securing ropes or other equipment. While the horn is a characteristic feature of Western-style saddles, it is not a necessary part of all saddles. Therefore, option D is incorrect.

Conclusion:
The necessary part of the word "saddle" is the seat (option B). The seat provides a secure and comfortable position for the rider, making it an essential component of the saddle.