Theories generated by scientific research were used to develop several products that, although useful, damage the environment severely.
Conclusion
The scientists who conducted research that was later used to develop several environmentally damaging products shouldn't be held responsible for that damage.
Evidence
They merely generated the theories. They couldn't foresee or restrict what people would make, using their research.
Evaluate
In pre-phrasing a correct answer for Principle questions, we're just trying to say, "If [premise language], then [conclusion] language", in general terms.
Since we're trying to justify a conclusion that the scientists "should not be responsible", we can doubt or eliminate any answers that don't give us a rule that puts "should not be responsible" (or something similar) on the right side.
Goal
Let's look for something like