Final answer:
The Celts expanded across Europe by 450 BCE, adopting technologies like chariot warfare, and were known for sacking Rome in 387 BCE. None of the provided options match the Celtic expansion into Britain, but the Romans invaded Britain in 43 AD.
Step-by-step explanation:
The Celts are known to have expanded dramatically across Europe by about 450 BCE. They adopted chariot warfare and currency, becoming more warlike and expansionist. Their raids became notable as they sacked Rome in 387 BCE and ventured into Hellenistic lands. By around 200 BCE, these Celtic raiders often settled down in new territories, forming distinct communities like Galatia in Anatolia.
Regarding the options provided, none of the dates directly corresponds to the period of Celtic expansion into Britain. However, the Romans invaded Britain in 43 AD, which might be the point of confusion.