Sure what do you need my dude
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.
Answer: I limited my conversation to general things, like the weather, so as not to arouse or upset even a person with mental problems.
Explanation: