Concept:
An अनेकार्थी शब्द (polysemous word) is a word that carries multiple related meanings depending on context. The word "जलज" is formed from:
जल + ज = जल में जन्म लेने वाला
It refers to anything that originates or is born in water.
Step 1: Meaning analysis of each option
• (J) कमल (Lotus): Grows and blooms in water, hence correctly called जलज.
• (K) मछली (Fish): Lives and reproduces in water, also correctly called जलज.
• (L) बादल (Cloud): Not born in water; instead it contains water vapor. It is correctly called जलद (giver of water), not जलज.
• (M) मोती (Pearl): Forms inside oysters underwater, hence also considered जलज.
Step 2: Final selection
Since J, K, and M satisfy the condition of "born in water", they correctly represent the meanings of जलज.
Correct set = J + K + M
Thus, Option (C) is correct.