Iron ore is found in Jharkhand in the district –

Explanation

During the relevant period, in the context of undivided Bihar, the correct answer was option (d). In 1990, Singhbhum district was divided into East Singhbhum and West Singhbhum. According to the Indian Minerals Yearbook, 2024, Bihar has iron ore reserves of 49439 thousand tonnes (hematite + magnetite).