Explanation:

- Practical: Generally means being concerned with the actual doing or use of something rather than with theory or ideas. It focuses on real-world applications and effectiveness.

- Option 1 - Everlasting: Means lasting forever or for a very long time. It doesn't relate to being practical or sensible, so it's not a synonym.

- Option 2 - Sensible: Means having or showing good sense or judgment. It's often associated with being practical because both involve realistic and effective decision-making.

- Option 3 - Applicable: Means relevant or appropriate. While it can sometimes overlap with practical, it's not as direct a synonym as sensible.

- Option 4 - Theoretical: Relates to the theory of a subject, not the practical application. It's the opposite of practical, making it an incorrect choice.

Your choice: Option 2 - Sensible.