linguistic question

Can you help me understand this Linguistics question?

two parts of questions, here is the detail

Part B: Islands

Identify what kind of island is violated in the following sentences:

(11)

*Which house did Sally ask who bought?

compare: Sally asked who bought WHAT?

(12)

*What did your brother buy a guitar and sell?

compare: Your brother bought a guitar and sold WHAT?

(13)

*Who did they agree with the claim that the police should arrest?

compare: They agreed with the claim that the police should arrest WHO?

(14)

*Who should that Mary hired have surprised you?

compare: That Mary hired WHO should have surprised you?

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