Select the correct answer.

Which question is testable?

A.
How does changing the amount of water affect the growth of corn?
B.
Is it ethical to use human tissue removed during surgery for scientific research?
C.
Are you happy with your new job?
D.
Will people be disappointed if car insurance rates increase?

A. How does changing the amount of water affect the growth of corn?

The correct answer is A. How does changing the amount of water affect the growth of corn? This question is testable because it can be answered through experimentation and data collection.

The question that is testable is A. "How does changing the amount of water affect the growth of corn?"

To determine if a question is testable, we need to look for two main factors: measurability and repeatability.

In option A, the question asks about the impact of changing the amount of water on the growth of corn. This is testable because it can be measured by conducting experiments using varying amounts of water and observing the growth of corn in each scenario. The experiment can be repeated multiple times to gather data and make comparisons.

On the other hand, options B, C, and D are not testable questions. Option B involves ethical considerations, which are subjective and cannot be tested scientifically. Option C asks about personal feelings, which are also not objectively measurable. Option D refers to opinions or future outcomes, which cannot be tested as they do not have objective measurements.

Therefore, the correct answer is A. "How does changing the amount of water affect the growth of corn?"