There are 24 High Courts in India as of January 2015. These High Courts are the highest judicial bodies at the state or union territory level. They are responsible for overseeing the functioning of subordinate courts within their jurisdiction and for ensuring justice is delivered effectively.

The Indian High Courts Act of 1861 established the first three High Courts in Calcutta, Bombay, and Madras. Over the years, as new states and union territories were formed, more High Courts were established to cater to the increasing demands of the growing population.

Here are the key reasons why the correct answer is option 'C' - 24 High Courts:

1. Historical Development:
- The first High Courts were established in Calcutta, Bombay, and Madras in 1862.
- These High Courts were established under the Indian High Courts Act of 1861.

2. Expansion and Formation of New High Courts:
- As new states and union territories were formed, more High Courts were established.
- The number of High Courts increased over time to ensure better access to justice for the people.

3. Jurisdiction:
- Each High Court has jurisdiction over one or more states or union territories.
- The jurisdiction of a High Court is determined by the President of India, considering factors such as population, geography, and other relevant factors.

4. Role and Function:
- High Courts have the authority to hear appeals, revisions, and writ petitions.
- They also have the power of superintendence over the subordinate courts within their jurisdiction.

5. Importance in the Judicial System:
- High Courts play a crucial role in the Indian judicial system by ensuring the proper administration of justice.
- They help in maintaining law and order and upholding the constitutional rights of individuals.

To summarize, as of January 2015, there were 24 High Courts in India. These High Courts have been established over time to cater to the growing population and ensure access to justice for all. They play a vital role in the Indian judicial system by overseeing the functioning of subordinate courts and ensuring justice is delivered effectively.