I am not sure that the policies are.
The correct answer to this open question is the following.
Although there are no options provided, we can say that Kant meant with that quote was "we cannot imagine a world where everyone makes deceitful promises, because the practice of promising presupposes trust and none would trust anyone in a world where everyone makes deceitful promises."
Emmanuel Kant, one of the most important philosophers of our times, considered that people should be very honest to have a good life and never compromise their word in vain because that would generate that other people would never trust this individual. For Kant, people had moral values and they should never try to cheat or manipulate other people. Respect was one of the most appreciated values for him.
Answer: It's an EXPERIMENT
Explanation: Experiment is done when we apply anything to a samples or conditions in other to study another sample or conditions.
Observation is done when, we study samples or conditions in it's natural way, without application of anything that may alter it's result.
Because the researcher has applied fertilizer to one side and did not apply to the other side, that means he has performed an experiment. Since he wasn't observing the two sample in it's natural way without any external application.
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Not in my opinion, construction workers do manual labor and they have to be very skilled and smart to build a sturdy home with the right measurements and all.