Hint: 'Patua' of Hibiscus sabdariffa is a type of vascular tissue that forms from the vascular cambium during secondary growth. The secondary growth is the one which is responsible for the growth in girth in plants, especially trees.
'Patua' of Hibiscus sabdariffa is a Secondary phloem. Hibiscus sabdariffa, which is commonly known as Roselle is a species of Hibiscus that is native to West Africa, used for the production of bast fiber and as an infusion, during which it may also be referred to as carcade. The plant is taken into account to possess antihypertensive properties. In some places, the main purpose of cultivation of the plant is the production of bast fiber 'patua' from the stem of the plant (secondary phloem) .
Additional Information: Phloem is defined as the living tissue which is present in the vascular plants which help to transport the soluble organic compounds which are made during photosynthesis and referred to as photosynthates, especially the sugar sucrose, to parts of the plant where needed. This transport process is named translocation. In trees, the phloem is found at the innermost layer of the bark. The phloem of the plant will mostly consist of the conducting cells, which are commonly known as the sieve elements, parenchyma cells, including both specialized companion cells or albuminous cells and also the unspecialized cells and supportive cells, which includes fibers and sclereids.
So, the correct answer is ‘(A) Secondary phloem’.
Note: Hibiscus sabdariffa, is an annual or perennial plant , which usually grows to 2–2.5 m (7–8 ft) tall. The leaves of this plant are mostly three- to five-lobed, 8–15 cm (3–6 in) long, arranged alternately on the stems.