Ancient structures, coins, pots, inscriptions, copper plates, manuscripts are examples of ____.
A. Sources of Science.
B. Sources of Environment.
C. Sources of geography.
D. Sources of History.

Hint: Among many old settlements and ancient structures, coins, pots, inscriptions, etc were found. Various old civilisations like Indus Valley Civilisation, the traces of past could be seen through the objects found within their settlements.

Complete answer:
 Ancient structures, coins, pots, inscriptions, copper plates, manuscripts are examples of sources of history. Historians use these objects to trace the past. Ancient structures tell about the architecture of the time and their advancement in this department. Coins tells which kind of metals were abundant in that particular era and this could help trace the timelines. Pots tells about the craftsmanship of that era and also, which kind of designs were popular and their advancement in that area. Inscriptions, copper plates and manuscripts are the written documents of the era which have noticeable and precious information about the past. It could contain their living conditions, the names of important people that lived within the era and the name of the place they used to reside in. All these information together tells a great deal about our past and how things ended for them. As, all these things help in tracing the past and the timeline, so they are considered the sources of history.

Hence, the correct answer is option (D).

Note: The sources of history were used to trace the past of a particular civilisation and what led to their downfall. This is important as we might get an idea how things changed and how they could change in the future. So, it is important to trace our past as it will help us in predicting our future.