The correct answer is option 'D': Static nature of the law. This means that the static nature of the law is not a reason for law reform.

Law reform refers to the process of making changes or amendments to existing laws in order to address various issues and challenges in society. It is a continuous process that aims to ensure that laws remain relevant, effective, and responsive to the changing needs and circumstances of individuals and society as a whole. There are several reasons why law reform is necessary, and the static nature of the law is not one of them.

Changing social values and priorities:
- One reason for law reform is the changing social values and priorities within a society. As societies evolve, their values, attitudes, and beliefs also change. This can lead to a misalignment between existing laws and the values and priorities of the society. Law reform helps to bridge this gap and bring the law in line with the changing values and priorities of the society.

Technological advancements:
- Another reason for law reform is technological advancements. Technology has a profound impact on various aspects of society, including communication, commerce, privacy, and security. Existing laws may not adequately address the legal and ethical issues arising from new technologies. Law reform is necessary to ensure that laws keep pace with technological advancements and provide appropriate legal frameworks to regulate and govern these new developments.

Economic developments:
- Economic developments can also necessitate law reform. As economies evolve and new industries emerge, laws may need to be updated or created to regulate these new economic activities. For example, the rise of the sharing economy and online platforms has required the development of new laws and regulations to ensure consumer protection, fair competition, and accountability.

Static nature of the law:
- The static nature of the law, on the other hand, refers to laws that are rigid and resistant to change. This can be a barrier to effective and responsive legal systems. However, it is not a reason for law reform itself. Rather, the static nature of the law is an obstacle that law reform seeks to overcome in order to ensure that laws remain relevant and adaptable to changing circumstances.

In conclusion, the static nature of the law is not a reason for law reform. Law reform is necessary due to changing social values and priorities, technological advancements, and economic developments. It aims to ensure that laws remain relevant, effective, and responsive to the needs of individuals and society as a whole.