Step 1: Understanding the Concept
A flower has four whorls: calyx, corolla, androecium and gynoecium, each with a specific function.
Step 2: Matching
A - II: androecium (stamens) produces pollen grains, the microspores.
B - III: gynoecium holds the ovules in which the embryo develops.
C - IV: corolla (petals) attracts pollinating agents.
D - I: calyx (sepals) protects the inner parts.
Step 3: Choose the option
The pairs A-II, B-III, C-IV, D-I match option (C).
Final Answer:
The correct matching is A-II, B-III, C-IV, D-I, option (C).
\[ \boxed{\text{(C) }\text{A-II, B-III, C-IV, D-I}} \]