Q. For a sandy soil, the angle of internal friction is 30°. If the major principal stress is 50 kN/m² at failure, the corresponding minor principal stress will be ?

• (A) 12.2 kN/m²
• (B) 16.66 kN/m²
• (C) 20.8 kN/m²
• (D) 27.2 kN/m²