How does the filament the plant reproduce

"The filament and anther are part of the system that is essential for the plant to reproduce. Before a flower bud opens and produces and releases pollen, it is encased in protective leaf-like growths called sepals. When a flower bud opens, its petals typically serve to attract insects and other animals that carry pollen to other plants, thus enabling fertilization. Some flower petals possess scents that draw insects to them" (Reference.com)

The answer is option a.