The structures furcula, urostyle, endostyle are present respectively in
A)Pavo, rhacophorus, branchiostoma
B)Casuaris, gegeneophis, amphioxus
C)Apteryx, rana, ascidia
D)Pavo, proteus, pyrosoma

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Hint: Wishbone is a forked bone seen in birds and some other species of dinosaurs. They were formed by the fusion of the two clavicles and the bony rod forming the last segment of the vertebral column of frogs, toads, and related amphibians.The endostyle is a longitudinal, ciliated, grooved organ on the ventral wall of the pharynx that secretes mucoproteins into the alimentary canal for filter feeding.

Complete answer:
Pavo is a group in the southern sky whose name is Latin for peacock. Pavo was first discovered on a 35-cm diameter celestial globe published in 1598 in Amsterdam by Plancius and Jodocus Hondius and was depicted in Johann Bayer's star atlas Uranometria of 1603, and was possible to conceived by Petrus Plancius from the explanation of Pieter Dirkszoon Keyser and Frederick de Houtman.
Rhacophorus is a kind of frog in the shrub frog family Rhacophoridae and the linked Hylidae make up the true tree frogs. They are generally found in India, Madagascar, Africa, and Southeast Asia. Over 40 species are currently identified .

These frogs possess long toes with physically powerful webbing between them which helps the animals to slow their fall to a glide. It also had a form of arboreal locomotion known as parachuting. They are as a result among the anurans commonly known as "flying frogs' '.
Branchiostoma is one of the minority living genera of lancelets . It is the genus of the family Branchiostoma.
These small vaguely eel or snake like animals are closely associated types of vertebrates. They do not have an accurate head with a skull capsule, eyes, nose, a well-developed brain etc. other than just a mouth adjacent to the gill slits with the somewhat enlarged anterior end of the dorsal nerve cord above and in front of them. These species generally dislike the light.

Hence, the correct answer is option (A)

Note: Furcula or wishbone is a forked bone found in birds (Pavo). They were formed by the combination of the two clavicles.
Urostyle is the bony rod forming the last segment of the vertebral column which are generally seen in frogs, food and related amphibians (Rhacophorus).
Endostyle is usually a longitudinal ciliated groove on the ventral wall of pharynx which gives out mucus to gather food particles. It is found in Urochordata and cephalochordata (Branchiostoma).