I'll say d.in an order that makes sense for the topic
I believe the correct answer is 20th Century: made.
"...when those muscles and joints were rendered capable of motion..." is used to mean - when Frankenstein was made, he was given the ability to move. The other options don't really convey the same meaning, so I believe the last option is correct.
May I ask what the questions are?
A person or animals intestines or internal organs, especially when removed or exposed
George shoots him in the back of the head, so he cant get himself into anymore trouble