A) This is still a reliable source because it clearly cites scientific research.
A is the correct answer because of the fact that they did the study over several dogs, feeding them the same amount of food, at the same time. They did everything the same, while Anna didn't for her dog.
Hope this helps.
I don't understand your question, and the details, it seems you have already answered your own question
Answer:
A. The word "while" helps the reader determine that the character goes to the market at the same time the water is heating.
Explanation:
Take this with a grain of salt, but I believe the answer is A.
