Which region lacks a federal privacy law protecting personal data of its citizens?

The correct choice indicates that the region lacking a federal privacy law protecting personal data of its citizens is the United States. While various states within the U.S. have implemented their own privacy laws, there is no comprehensive federal law that provides overarching protections for personal data. This means that data privacy regulations can vary significantly from state to state, potentially leading to gaps in protection for individuals' personal information.

In contrast, several other regions, such as Europe, have established robust data protection regulations, notably the General Data Protection Regulation (GDPR), which establishes strict guidelines for handling personal data. Countries in Asia also have varying laws surrounding data privacy, with some nations moving toward more stringent protections similar to those of Europe.

Thus, the lack of a singular, comprehensive federal framework for data privacy in the United States distinguishes it from these other regions where such protections are either in place or being developed.