Jharkhand shares the longest border with Bihar, running approximately 1,023 kilometers along the south.

Using compound growth formula: Final Population = Initial × (1 + rate)^time = 5 × (1.02)² = 5 × 1.0404 = 5.202 million

Ashoka ascended to the throne of the Mauryan Empire in 273 BCE. He ruled from Pataliputra (modern Patna, Bihar) and became one of India's greatest emperors after the Kalinga War in 261 BCE.

The Bodhi tree is situated in Bodh Gaya, which is in Gaya district of Bihar. The Mahabodhi Temple complex surrounding this sacred tree is a UNESCO World Heritage Site.

Using the trapezoid area formula: Area = (a+b)×h/2 where a=100m, b=60m, h=80m. Area = (100+60)×80/2 = 160×80/2 = 12,800/2 = 6,400 m². Wait, let me recalculate: (100+60)×80/2 = 160×40 = 6,400 m². The correct answer should be A, but based on the given options matching our calculation of 6,400 m², option A is correct.

Muzaffarpur district is famous for rice production and is often referred to as the 'Rice Bowl of India'. It is also known for litchi cultivation and contributes significantly to Bihar's agricultural economy.

Pataliputra (modern Patna) was the capital of the Mauryan Empire. It was one of the largest and most prosperous cities of its time and served as the political and administrative center of the empire.

The Lichchhavi Republic had its capital at Vaishali. It was one of the earliest republican states in India. Buddha visited Vaishali multiple times, and it was the site of the Second Buddhist Council.

Mahavira was born in Vaishali district around 599 BCE. He preached non-violence and established the principles of Jainism. Vaishali holds great significance in Jain religious tradition.

Emperor Aurangzeb commissioned the construction of the Patna Mosque (Jama Masjid) in the 17th century. It is one of the largest mosques in India and features prominent Mughal architecture.