Hey there ;)
Given that:
Question:- Why did the author most likely include the underlined descriptive details?
(A) to convince the reader the robot is a pet
(B) to convince the reader the robot is a rascal
(C) to entertain the reader with an amusing image
(D) to entertain the reader with an unusual joke
Answer:-
The correct answer is Option D.
Explaination:-
Since its written "A researcher held the hose that connected the robot to its power source. It looked like he was walking a mechanical dog on a leash."
This tells that the researcher is doing a specific work and for its use, he is using the robot. As he uses it, he connects a hose for his job. From the researcher's usage, it feels nothing unusual. But from the reader's perspective, it may feel like a common situation in which people tie a dog. Even though it isnt what is happening now but it relates to such a comedy situation.
Therefore Option D or fourth option is correct.