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 ?

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
• C. (A) is true, but (R) is false.
• D. (A) is false, but (R) is true.