First foreign traveller to visit Bihar was

The correct answer is: B. Fa-Hien

Fa-Hien was a Chinese Buddhist monk who traveled to India in search of Buddhist scriptures. He is believed to have visited Bihar in the 5th century CE. He wrote a book about his travels, which is an important source of information about India at that time.

Megasthenes was a Greek ambassador to India in the 4th century BCE. He wrote a book about India, which is also an important source of information about India at that time. However, there is no evidence that he visited Bihar.

Hiuen Tsang was a Chinese Buddhist monk who traveled to India in