The elastic compression Δ L of a pile can be calculated by the expression based on___________$

• A. Terzaghi‚Äö√Ñ√∂‚àö√ë‚àö¬•s theory
• B. Hooke‚Äö√Ñ√∂‚àö√ë‚àö¬•s law
• C. Meyerhof‚Äö√Ñ√∂‚àö√ë‚àö¬•s theory
• D. Hiley‚Äö√Ñ√∂‚àö√ë‚àö¬•s formula