The correct answer is Chirand.
Chirand is a prehistoric site in the Saran district of Bihar, India. It is located on the banks of the Son River, about 100 kilometers from Patna. The site has been excavated since the 1960s, and it has yielded evidence of human occupation from the Mesolithic period to the early historical period.
The most significant finds at Chirand are the bone tools and terracotta figurines. The bone tools are made from the bones of animals such as deer, cattle, and buffalo. They include a variety of tools, such as awls, needles, and scrapers. The terracotta figurines are of humans, animals, and birds. They are often decorated with geometric patterns.
The bone tools and terracotta figurines at Chirand provide evidence of the sophistication of the prehistoric people who lived in the area. They also show that these people had a complex culture.
The other options are incorrect because they are not prehistoric sites in Bihar. Senuwar is a historical site in the Rohtas district of Bihar. Taradih is a prehistoric site in the Gaya district of Bihar. Koldihwa is a prehistoric site in the Sonbhadra district of Uttar Pradesh.