Which of the following is a nonpoint-source of water pollution? O A. A sewage treatment plant
O B. An oil refinery
O c. A factory
O D. A suburban development

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.