Answer: D. 20th Century: to make.
Step-by-step explanation: In the given line from "Frankenstein" by Mary Shelley we can see how the speaker (Dr. Frankenstein) is describing his creation, how ugly it was and how he was able to move. In this lines the definition of "render" that is most likely suited is the one from the 20th century: to make. When we replace this definition in the sentence, it makes perfect sense: "..when those muscles and joints were made capable of motion.."