The Silk road is a rode between ancient Rome and ancient China. Any road that traders took from and to these two places was called the silk road. If you need help writing a paper, here is a college essay on the silk road. This should help: https://www.learner.org/courses/worldhistory/support/reading_9_3.pdf
The first one is the correct one
Social isolation of rhesus monkeys for the first 6 to 12 months of life produces severe and persistent behavioral effects including social withdrawal, rocking, huddling, self-clasping, stereotyped behaviors, and inappropriate heterosexual and maternal behaviors as adults.