I believe the answer is: Reference your Owners Manual
owner's manual would be filled with information and guidelines on how to obtain the maximum benefit from your product. This would include things such as special features, how to maintenance to ensure product's longevity, and steps need to be taken in order to contact customers services.
Answer:
A
Explanation:
Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. ... A decrease in pH values from 5.0 to 4.0 means that the acidity is 10 times greater.
There's no options, so I'm not sure if this is correct but- I'd say the word that fills the blank, would be "social"
~Good luck!