Concept:
Droughts are classified on the basis of rainfall deficiency, agricultural impact, water availability, and ecological damage.
Step 1:
Meteorological drought occurs due to prolonged deficiency and uneven distribution of rainfall.
\[
A \rightarrow I
\]
Step 2:
Agricultural drought occurs when soil moisture becomes insufficient for crop growth.
\[
B \rightarrow II
\]
Step 3:
Hydrological drought happens when lakes, rivers, and reservoirs experience reduced water levels.
\[
C \rightarrow III
\]
Step 4:
Ecological drought affects ecosystems and reduces natural productivity due to water shortage.
\[
D \rightarrow IV
\]
Step 5:
Thus, the correct arrangement is:
\[
A-I,\ B-II,\ C-III,\ D-IV
\]
\[
\boxed{\text{(1) A-I, B-II, C-III, D-IV}}
\]