The best answer is:
D. Citizenship was granted to landowning men of Roman heritage or those who had it granted by a general of the Roman military through pledging loyalty to the republic. Citizens were able to be in the assemblies and elect assembly members.
In the Roman Republic, citizenship was generally limited to free-born males who were landowners, and it could also be granted to individuals from conquered territories if they pledged loyalty to Rome. One of the key benefits of citizenship was participation in the political process, including the right to vote in assemblies and run for certain political positions, which played a significant role in the governance of the Republic.