Based on historical evidence from primary sources, the most accurate response regarding the relationships between Christians and Jews in Spain during the Middle Ages is:
Jews were required to live separate lives, but were allowed to have some of their own laws.
During this time, Jews often faced restrictions that required them to live separately from Christians, particularly in terms of community and religious practices. While they maintained some level of autonomy and were allowed to follow their own religious laws, they were also subjected to various regulations and discriminatory practices imposed by the Christian authorities.