UGC NET History Q46

Question

Given below are two statements, one labelled as Assertion (A), and the other labelled as Reason (R).
Assertion (A): In the medieval period the dam was as much an index of the value of copper, as the rupee was of silver. Interestingly the regional price variations attained a much greater importance in the case of copper metal than in that of gold or silver.
Reason (R): The main supplies were from the mines of the northern and eastern slopes of the Aravalli and the Vindhyan ranges. The proximity to these could play a large part in determining the extent of differences in price among various markets.
In the context of the above two statements which of the following is correct?