Choose the Correct sentence.

This question tests your understanding of article usage and sentence structure. When referring to an entire class or species, English often uses the definite article "the" with a singular noun. Thus, "The horse is a faithful animal" correctly expresses a general truth about horses.

The sentence is grammatically correct because "the horse" represents the whole species, while "a faithful animal" describes one of its general characteristics. Although "A horse is a faithful animal" is also grammatically acceptable in modern English, traditional competitive examinations usually prefer "The horse is a faithful animal."

• Subject: The horse (representing the species).
• Predicate: Is a faithful animal.
• Rule: The definite article can be used to represent an entire class of animals.

Therefore, the correct answer is: "The horse is a faithful animal."