Answer:
In Sparta, only nobility could become citizens. (D)
Step-by-step explanation:
In Sparta, citizenship was limited to a small group of male descendants of the original Spartan conquerors, known as the Spartiates. The Spartiates were a small minority of the population, and they enjoyed special privileges and responsibilities, such as military training and public office. The majority of the population in Sparta were non-citizens who were subjected to Spartan rule.