The correct answer is: A. a-1, b-2, c-3, d-4
List I: * Gold * Dolomite * China clay * Flexible sandstone
List II: * Ambala * Mahendragarh * Gurugram * Charkhi-Dadri
Explanation: * Gold is found in Ambala. * Dolomite is found in Mahendragarh. * China clay is found in Gurugram. * Flexible sandstone is found in Charkhi-Dadri.
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