Which of the following is/are largely mined in Bihar? I. Coal II. Iron III. Manganese IV. Petroleum Choose the correct answer from the following :

Explanation

During the relevant period, coal, iron ore and manganese— all three—were found. Petroleum was not found here. Therefore, in the context of undivided Bihar during that period, the correct answer was option (c). According to the Indian Minerals Yearbook, 2023, minerals produced in Bihar include—coal, mica, quartz/silica sand, quartzite, talc/soapstone/steatite, bauxite, china clay, feldspar, fire clay, gold, granite, iron ore (hematite + magnetite), lead-zinc, pyrite and limestone.