Choose the option that correctly sequences the following sentences.

1. But inside the furnaces are humming and hot.

2. The factories rows and rows of them are surrounded by high walls.

3. Here, mountains of industrial garbage, including tones of discarded electronic products, are ripped apart, smelted and processed daily.

4. Like the dark, satanic mills over the bleak landscape, their gates locked, the hand of industry apparently stilled.

5. Spread over a radius of 6 km and employing an estimated 12,000 workers, this is a recycling hub at the Mandoli Industrial Area in east Delhi.