Option (i) Food is correct. The Consumer Price Index (CPI) for industrial workers is designed to measure changes in the cost of living for this specific group. Among the items in the typical basket of commodities consumed by industrial workers, Food carries the highest weight. This is because a significant portion of an industrial worker's expenditure is spent on food items compared to other categories like Housing or Clothing. The weights assigned to different items reflect their relative importance in the consumption pattern of the target group.