The correct answer is option 'D', neither of them.

Explanation:
The Khajuraho Temples are a group of Hindu and Jain temples located in Khajuraho, Madhya Pradesh, India. They were built during the Chandela dynasty, which ruled in the region from the 9th to the 13th century.

1. Khajuraho school was developed by Chola rulers: Incorrect
The Khajuraho school of art was not developed by the Chola rulers. It was developed by the Chandela rulers, who were not associated with the Chola dynasty. The Chandela rulers were known for their patronage of art and architecture, and they built the magnificent temples at Khajuraho.

2. The temples in Khajuraho School were made of marble: Incorrect
The temples in Khajuraho were not made of marble. They were primarily made of sandstone, which was abundant in the region. The sandstone was intricately carved to create the beautiful sculptures and architectural elements that are characteristic of the Khajuraho temples.

The Khajuraho temples are renowned for their intricate stone carvings depicting various aspects of life, love, and spirituality. The sculptures on the temples depict deities, celestial beings, mythical creatures, and scenes from the everyday life of people during that time. These sculptures are considered to be some of the finest examples of Indian art and architecture.

The temples at Khajuraho were constructed over a period of several centuries and are divided into three groups: the Western, Eastern, and Southern groups. Each group has its own unique architectural style and features. The temples were dedicated to different Hindu deities and were used for worship, meditation, and religious ceremonies.

Although the Khajuraho temples were once a thriving religious and cultural center, they fell into decline and were eventually abandoned. Over time, they were hidden by the surrounding forests and rediscovered in the 19th century. Today, the Khajuraho temples are a UNESCO World Heritage Site and attract visitors from around the world who come to admire their exquisite craftsmanship and architectural beauty.

In conclusion, neither of the statements given in the question is correct. The Khajuraho school of art was developed by the Chandela rulers, not the Chola rulers, and the temples at Khajuraho were primarily made of sandstone, not marble.