Step 1: Recall currency–country pairs.
Iraq uses the Iraqi Dinar. Iran uses the \emph{Rial}, Saudi Arabia the \emph{Riyal}, and Afghanistan the \emph{Afghani}.
Step 2: Eliminate by mismatch.
Options (A), (C), and (D) pair with other currency names, not \emph{Dinar}.
Step 3: Conclusion.
Thus the correct choice is (B) Iraq.