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Amphibians comprises an estimated 6,770 extant species that inhabit tropical and temperate regions around the world. All living species are classified in the subclass Lissamphibia, which is divided into three orders: Urodela (鈥渢ailed鈥�), the salamanders; Anura (鈥渢ail-less鈥�), the frogs and Apoda (鈥渓egless ones鈥�), the caecilians.

Frogs are amphibians that belong to the order Anura or Salientia (jumpers). Hence, option (a) is the correct answer.

b. Urodela

Salamanders are amphibians that belong to the order Urodela. Hence, option (b) is the incorrect answer.

c. Caudata

Caudata is the other name for the order Urodela which includes salamanders. Hence, option (c) is the incorrect answer.

d. Apoda

Apoda include caecilians a group of amphibians that do not possess limbs. Hence, option (d) is the incorrect answer.