Step 1:
Elastic demand means percentage change in demand is greater than percentage change in price.
Thus:
\[
A \rightarrow II
\]
Step 2:
Inelastic demand means percentage change in demand is less than percentage change in price.
Thus:
\[
B \rightarrow I
\]
Step 3:
• Unit elastic demand $\rightarrow$ Equal percentage changes
• Perfectly inelastic demand $\rightarrow$ Demand remains unchanged
Thus:
\[
C \rightarrow III
\]
\[
D \rightarrow IV
\]
Step 4:
Final matching:
\[
A-II,\; B-I,\; C-III,\; D-IV
\]
Hence, the correct answer is:
\[
\boxed{\text{(1) A-II, B-I, C-III, D-IV}}
\]