In female mud crabs (Scylla serrata), fertilized eggs are extruded and carried beneath the abdominal flap as a compact egg mass ("berry" or "sponge").
Under optimal tropical water temperatures of $26.5^\circ\text{C} - 31^\circ\text{C}$ and salinity of $30-34\text{ ppt}$, embryonic incubation requires $7 - 14\text{ days}$ (typically 9–12 days).
The eggs change color from bright yellow-orange to deep brown and finally dark grey before releasing thousands of free-swimming Zoea-1 larvae.
Correct Option: Option 3 (7-14 days).
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