Best Sentence Symbiotic Relationship

In each of the questions given below, four different ways of writing a sentence are indicated. Choose the best way of writing the sentence.

1. A symbiotic relationship develops among the contractors, bureaucracy and the politicians, and by a large number of device, costs are artificially escalated and black money is generated by underhand  deals.
2. A symbiotic relationship develops among contractors, bureaucracy and politicians, and costs are  artificially escalated with a large number of devices and black money is generated through underhand  deals.
3. A symbiotic relationship develops among contractors, bureaucracy and the politicians, and by a large  number of devices costs are artificially escalated and black money is generated on underhand deals.
4. A symbiotic relationship develops among the contractors, bureaucracy and politicians, and by large  number of devices costs are artificially escalated and black money is generated by underhand deals.