The correct sequence of the arrival of foreign travelers to medieval India is as follows:

1. Al-Biruni: Al-Biruni, an Islamic scholar and polymath, was one of the earliest foreign travelers to visit medieval India. He arrived in India in the 11th century, during the reign of Sultan Mahmud of Ghazni. Al-Biruni's extensive knowledge of Indian culture, religion, and philosophy is documented in his famous work "Kitab al-Hind," which provides valuable insights into medieval Indian society.

2. Ibn Battuta: Ibn Battuta, an Arab explorer, arrived in India in the 14th century. His journey to India was part of his extensive travels across the Islamic world. Ibn Battuta's detailed accounts of his experiences in India are recorded in his travelogue "Rihla." He visited various regions in India, including Delhi, Gujarat, and the Malabar Coast, and described the political, social, and cultural aspects of medieval Indian society.

3. Duarte Barbosa: Duarte Barbosa, a Portuguese explorer and writer, arrived in India in the early 16th century. He traveled as part of the Portuguese expedition led by Vasco da Gama. Barbosa's observations of India are documented in his work "Livro de Duarte Barbosa," which provides valuable information about the trade, geography, and customs of medieval India.

4. Marco Polo: Marco Polo, an Italian merchant traveler, visited India during the late 13th century. His travels to India were part of his extensive journey across Asia. Marco Polo's observations of India are recorded in his famous book "The Travels of Marco Polo." Although some historians debate the accuracy of his accounts, Polo's descriptions of Indian cities, trade, and society provide valuable insights into medieval India.

5. Francois Bernier: Francois Bernier, a French physician and traveler, arrived in India during the 17th century. He visited various regions, including Delhi, Agra, and Kashmir, during the reign of Mughal emperor Aurangzeb. Bernier's observations of Mughal India are documented in his book "Travels in the Mogul Empire," which provides valuable insights into the political, cultural, and social aspects of medieval India under Mughal rule.

In summary, the correct sequence of the arrival of foreign travelers to medieval India is D, A, B, C, E. Al-Biruni was the earliest traveler, followed by Ibn Battuta, Marco Polo, Duarte Barbosa, and Francois Bernier.