UPSC 1998: What is the correct chronological order in which the following appeared in India? I. Gold coins II. Punch-marked silver coins III. Iron plough IV. Urban culture Select the correct answer using the codes given below:

The earliest urban culture in India was the Harappan civilisation (c. 2600 BCE). Iron-technology-based ploughs spread in the later-Vedic age (c. 1000-700 BCE). Punch-marked silver coins appeared with the Mahājanapadas in the 6th century BCE, whereas the first regular gold coinage was introduced much later by the Indo-Greeks/Kuṣāṇas (2nd century BCE–1st century CE). Thus the sequence is IV → III → II → I, i.e., option (d). ([uttarpradesh.pscnotes.com](https://uttarpradesh.pscnotes.com/uppcs-prelims/what-is-the-correct-chronological-order-in-which-the-following-appeare/?utm_source=openai))