Step 1: Understanding the Concept:
Different rainfall representations describe different characteristics such as intensity, point measurement, accumulated depth, and average areal rainfall.
Step 2: Detailed Explanation:
Hyetograph represents rainfall intensity with respect to time.
Isohyetal Method estimates average rainfall over an area using contours of equal rainfall.
Rain Gauge measures rainfall at a single location, known as point rainfall.
Mass Curve shows cumulative or accumulated rainfall versus time.
Therefore, the correct matching is:
A $\rightarrow$ I
B $\rightarrow$ III
C $\rightarrow$ II
D $\rightarrow$ IV
Step 3: Final Answer:
The correct option is (A).