A; if the subject is biology, this is the only one that makes sense. You could conduct an experiment to test the water's effect on the growth of corn by using different measures of water on corn plants to see the differentiation among each.
A). How does changing the amount of water affect the growth of corn.
Explanation:
Option A is a quantitative measurement whereas options B, C and D are qualitative measurement. These options cannot be analysed by any mathematical tool or by any scientific reasons. Peoples emotions and logical reasoning are involved in it that includes ethics, happiness or disappointment. Only option A can be evaluated or can be tested by some scientific reasons. So only option A is testable.
When a new technology is introduced, there is geo-testing performed to see how this new extraction method effects the environment. The over all effects and efficiency are what should determine the acceptance of these solutions.
