The correct option is B Peduncle
The peduncle is the main axis of an inflorescence or the axis bearing a flower or fruit. Thalamus is the thickened part of a stem from which the flower organs grow in angiosperms. The petiole is the cylindrical stalk that joins the leaf base with the leaf blade or lamina. The pedicel is a stem that attaches a single flower to the inflorescence.
So, the correct answer is 'Peduncle'.