The correct answer is: A. Harshavardhana.
Hiuen-Tsang visited India during the reign of Harshavardhana, who was the ruler of the Vardhana dynasty. Harshavardhana was a powerful and influential ruler who unified much of northern India. He was also a patron of Buddhism and invited Hiuen-Tsang to India to study and translate Buddhist texts.
Hiuen-Tsang was a Chinese Buddhist monk who traveled to India in the 7th century CE. He spent six years in India, during which time he visited many Buddhist monasteries and temples. He also met with many Indian scholars and philosophers. Hiuen-Tsang’s account of his travels, the “Record of the Western Regions”, is an important source of information about India in the 7th century CE.
The other options are incorrect because they were not rulers of Haryana during the time that Hiuen-Tsang visited India.
- Rajyavardhana was the elder brother of Harshavardhana. He was killed in battle by the Huna ruler, Mihirakula.
- Prabhakarvardhana was the father of Harshavardhana. He was the ruler of the Vardhana dynasty before Harshavardhana.
- Madhavardhana was the grandfather of Harshavardhana. He was the founder of the Vardhana dynasty.