If the cost of "x" metres of wire is "d" rupees, what is the cost of "y" metres of wire at the same rate?

• A.  \[Rs.\,\left( \frac{yd}{x} \right)\]                            
• B.  \[Rs.\,(xy)\]     
• C.         \[Rs.\,(yd)\]     
• D.         \[Rs.\,\left( \frac{xy}{d} \right)\]