Explanation:

Coloured rock paintings:
Coloured rock paintings are a form of ancient art where prehistoric humans used natural pigments to create paintings on the walls of caves and rock shelters.

First done by Cro-Magnon man:
The correct answer is option 'A', which states that coloured rock paintings were first done by Cro-Magnon man.

Cro-Magnon man:
Cro-Magnon man refers to the early modern humans who lived in Europe between 40,000 and 10,000 years ago. They were anatomically similar to modern humans and were known for their sophisticated tools, art, and culture.

Evidence:
The evidence for Cro-Magnon man being the first to create coloured rock paintings comes from archaeological excavations and the dating of the paintings. The oldest known examples of coloured rock paintings are found in Europe, specifically in caves like Lascaux in France and Altamira in Spain, which date back to approximately 40,000 years ago. These paintings depict animals, humans, and abstract designs, and were created using various pigments and techniques.

Artistic skill:
The coloured rock paintings created by Cro-Magnon man demonstrate a high level of artistic skill and sophistication. The artists used different colors, such as red, black, yellow, and white, which were derived from natural sources like minerals, charcoal, and animal fats. They also utilized techniques like finger painting, blowing pigment through tubes, and using brushes made from animal hair.

Symbolic and ritualistic significance:
These paintings were not merely decorative but held symbolic and ritualistic significance for the Cro-Magnon people. They depicted scenes from their daily lives, hunting activities, and religious beliefs. The animals portrayed in the paintings were often ones that were hunted, suggesting a connection between the artwork and their survival and spiritual beliefs.

Preservation:
The preservation of these rock paintings for thousands of years is remarkable. The caves in which they were created provided a stable environment that protected the paintings from natural elements and human interference. Additionally, the pigments used in the paintings were durable and resistant to fading.

Legacy:
The coloured rock paintings created by Cro-Magnon man are considered some of the earliest and most significant examples of human artistic expression. They provide valuable insights into the lives, beliefs, and cultural practices of our early ancestors. These paintings also serve as a testament to the creativity and imagination of early humans, showcasing their ability to communicate and express themselves through visual art.

In conclusion, coloured rock paintings were first done by Cro-Magnon man, who lived in Europe around 40,000 to 10,000 years ago. These paintings are a testament to their artistic skill, cultural practices, and symbolic beliefs. The preservation of these paintings has allowed us to study and appreciate the rich artistic heritage of our early ancestors.