Answering which question would best allow you to dig deeper into the content at the heart of the passage? why does a fresh water body, when cooled, start freezing from the surface downward? why does the behavior of fresh water cooling by convection change at 4°c? can the temperature of the air above a fresh water body be subzero at the end of summer? can ice form on the surface of fresh water if the lower layers are not frozen?

explanation:

i dont know what the answer so im making you laugh here's ya joke lol

the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

hope this !