Q. 'Lang factor' is defined as the ratio of the capital investment to the delivered cost of major equipments. The value of 'Lang factor' for fixed capital investment, for a solid-fluid processing chemical plant ranges from

• (A) 1.2 to 1.4
• (B) 2.5 to 2.7
• (C) 4.2 to 4.4
• (D) 6.2 to 6.4