Fertilization in flowers occurs in the ovule

Steps:

• Pollen grains germinate on the stigma, forming a pollen tube.
• The pollen tube grows through the style to reach the ovary.
• Sperm cells travel to the ovule inside the ovary.
• Fertilization happens when sperm fuses with egg and central cell in the embryo sac.

Why A is correct:

• A labels the ovule, where double fertilization fuses male and female gametes, as defined in angiosperm reproduction.

Why the others are wrong:

• B is the style, a pathway for pollen tube growth, not the fusion site.
• C is the anther, site of pollen production, before fertilization.
• D is the stigma, where pollen lands, but no gamete fusion occurs.

Final answer: A