Question: The ancient buddhist site  in the lower Krsna Valley can be traced to at least what century BCE?
Sentence: " They note that the ancient Buddhist sites in the lower Kṛṣṇa Valley, including Amaravati, Nāgārjunakoṇḍā and Jaggayyapeṭa "can be traced to at least the third century BCE, if not earlier."
Answer in sentence: yes