What are the Scottish, Welsh, and Irish descendants of?

Please help due today

What are the Scottish, Welsh, and Irish descendants of?

Different peoples; the Irish from the Celts, and the English from the Anglo-Saxons who invaded from northern Europe and drove the Celts to the country's western and northern fringes.

Irish and Scottish Gaelic, which are both descended from Middle Irish [Goidelic languages] and Welsh and Breton, which are both descended from Common Brittonic [Brittonic languages]

i think it is the third one.