Answer:
B.Sepal and petal are not directly involved in sexual reproduction.
Step-by-step explanation:
The petals are modified leaves of a plant, they attract pollinators. The sepals serve to protect the reproductive parts.
The answers a,c and d are directly involved in reproduction. Stigma and stile and ovule and ovary are female parts. They are involved in collect pollen grains and Produce sex cells (ovules). The anthers produce male sex cells (pollen).