When julius caesar landed in britain, britain was inhabited by ?

Celtic people

Explanation:

When the Romans arrived in Britain and conquered big portion of it, they encountered the Celtic people. The Romans were very familiar with the Celtic people, as they lived in northern Italy, as well as most of Western Europe. The Celtic people in Britain had multiple similarities with the continental Celts, but also had their own unique traits, both physical and cultural. While the Celtic tribes were the dominant force in Britain, it has to be mentioned that there were also lot of Native British people, or rather big portion of them had accepted the Celtic culture. In the northern part of the island though, there were the Picts (still people of unknown origin) which were never conquered and were the reason for the building of Hadrian Wall.

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i believe your answer is d)