In timber selection for civil and structural works, where is high-quality teak wood especially suitable due to its durability, dimensional stability, and resistance to decay? Choose the single best overall use-case set from the options below.

Introduction / Context:
Teak (Tectona grandis) is one of the most prized hardwoods used in civil engineering and carpentry. This question checks whether you know why teak is preferred across multiple demanding applications, not just decorative furniture.

Given Data / Assumptions:

• Teak contains natural oils and silica that enhance decay and termite resistance.
• It exhibits good dimensional stability and moderate to high strength.
• Applications considered: sports gear, furniture, and railway sleepers.

Concept / Approach:

Materials selection balances strength, durability, workability, and environment. Teak’s natural oils resist moisture ingress and biological attack; its grain and strength support shock-loaded uses. Historically, well-seasoned teak has been used even for sleepers where availability and cost permitted, and widely for marine/furniture uses due to weathering resistance.

Step-by-Step Solution:

Verification / Alternative check:

Service records in humid/tropical climates show teak’s superior life against decay and borers; marine decks and exterior joinery further confirm its robustness.

Why Other Options Are Wrong:

Only furniture: too narrow; it ignores other valid uses. Individual options omit teak’s broader suitability.

Common Pitfalls:

Assuming cost equals unsuitability; suitability refers to performance, not economics. Confusing “common today” with “suitable” historically and technically.

Final Answer:

All the above