A given determinate truss is loaded with gravity loads. Under these loads different nodes undergo deflection horizontally and vertically. Thereafter the truss is subjected to a temperature drop of 50°C in the lower chord only. The coefficient of expansion or contraction α = 11.7 × 10-6/°C. Which of the following statements is true?

• A. Vertical and horizontal deflection along lower chord nodes remains the same
• B. Vertical and horizontal deflection along lower chord nodes shall change.
• C. Horizontal deflection along lower chords nodes shall change but vertical deflection shall not change
• D. None of the above