Which of the following is a key reason that jonathan swift wrote gulliver’s travels?

to educate people about the value of reason, restraint, and common sense
to encourage people to be more imaginative and inventive
to make friends with the politicians of the time period
to practice writing to improve his essays and pamphlets

Jonathan Swift wrote Gulliver's Travel because he wanted to expose to people his complaints about the elite class of workers- politicians, scientists, and philosophers. He ridiculed people as proud and greedy and used satire in this literary piece to express his thoughts. The key reason of Swift's creation of  Gulliver’s Travels is to educate people about the value of reason, restraint, and common sense. 

The first option is correct. A. to educate people about the value of reason, restraint, and common sense

It is indeed true that being somehow invisible and not very accessible of the groundwater, impose challenge and will not allow people to monitor the affected areas. It is recommended to dig deep well and ask for samples.