During the construction period, price variation clause in contracts caters to______.

A)
Rate of inflation
B)
Increase in rates of only important materials
C)
Variation in cost in materials element, labour element and petrol-oil-lubricant element
D)
Variation in total cost of the project on an ad hoc basis

Correct Answer :   Variation in cost in materials element, labour element and petrol-oil-lubricant element