he showed me his new cab for which he had paid a hundred thousand rupees
He showed me his new cab which he had paid a hundred thousand rupees for it.
A relative clause is usually a clause that changes a noun or noun phrase, and uses a grammatical tool to indicate that one of the arguments within a related clause has the same reference to that noun or noun phrase.
The 5 relative clause are that, which, who, whom and whose.
Hence, the correct answer is Which.
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