बेलन नदी घाटी के ऐतिहासिक पुरापाषाणकालीन स्थल मुख्य रूप से उत्तर प्रदेश के किस जिले में स्थित हैं?

Which of the following Indian states is historically known as the 'Cradle of Buddhism'?

Which of the following statements are correct with reference to the ancient historical and cultural geography of present-day Uttar Pradesh? I. Lord Buddha delivered his first sermon at Kushinagar. II. Kuru, Panchala, Vatsa, and Videha were among the prominent Mahajanapadas/regions of Madhyadesa, which formed the early region of the state. III. Emperor Ashoka undertook several public welfare works in Madhyadesa.