The correct option is B Number and arangerment of floral parts
Floral diagram represents number and arangerment of floral parts. Floral diagram is a graphic representation of flower structure. It shows the number of floral organs, their arrangement and fusion. Different parts of the flower are represented by their respective symbols. Floral diagrams are useful for flower identification or can help in understanding angiosperm evolution. Therefore, the correct answer is option B.