Question

It is possible to reduce river pollution by the use of sewage water for irrigation:
1) observation
2) inference
3) conclusion
4) objective

Answer 1

Observation:
The condition of river
sewage water current use
pollution rate
water will be saved
irrigation becomes easy

interference:
the decrease in pollution is possible if sewage water starts treating

conclusion:
observe other countries who are using the sewage treatment like syria

objective:
It is possible to reduce river pollution by the use of sewage water for irrigation