The correct answer is: C. 7th Century.
The Harsha style of painting developed during the 7th century in India. It is characterized by its use of bright colors, bold lines, and intricate patterns. The style is named after the Indian emperor Harshavardhana, who ruled over much of northern India during the 7th century. Harsha was a patron of the arts, and his court was home to many talented artists. The Harsha style of painting is often seen in Buddhist and Hindu temples, as well as in secular works of art.
Option A is incorrect because the 6th century was the period of the Gupta Empire, which was a golden age of Indian art and culture. The Gupta style of painting is characterized by its use of realistic proportions, delicate lines, and muted colors.
Option B is incorrect because the 10th century was the period of the Chola Empire, which was another golden age of Indian art and culture. The Chola style of painting is characterized by its use of bold colors, dynamic compositions, and intricate details.
Option D is incorrect because the 16th century was the period of the Mughal Empire, which was a period of great cultural and artistic exchange between India and the Middle East. The Mughal style of painting is characterized by its use of Persian and Indian influences, as well as its use of gold and silver leaf.