What are homonyms?
A. A word same in meaning
B. A word same in sound
C. A word same in spelling
D. Both b & c

Hint:In phonetics, homonyms, comprehensively characterized, are words which are homographs (words that share a similar spelling, paying little heed to articulation) or homophones (words that share a similar elocution, paying little heed to spelling), or both. For instance, as per this definition, the words column (drive with paddles), line (contention) and line (a direct game plan) are homonyms, just like the words see (vision) and ocean (waterway).

Complete answer:
A more prohibitive or specialized definition considers homonyms to be words that are at the same time homographs and homophones– in other words they have indistinguishable spelling and elocution, while keeping up various implications. Models are the pair tail (part of a plant) and tail (follow/bug an individual) and the pair left (past tense of leave) and left (inverse of right).
A differentiation is in some cases made between evident homonyms, which are inconsequential in inception, for example, skate (coast on ice) and skate (the fish), and polysemous homonyms, or polysemy, which have a common starting point, for example, mouth (of a stream) and mouth (of an animal).
The connection between a bunch of homonyms is called homonymy, and the related descriptive word is homonymous or homonymic. The descriptive word "homonymous" can furthermore be utilized any place two things share the equivalent name,free of how intently they are or are not related regarding their significance or derivation. For instance, the name Ōkami is homonymous with the Japanese expression for "wolf" (Ōkami).
The words bow and bough are models where there are two implications related with a solitary articulation and spelling (the weapon and the bunch); two implications with two unique elocutions (the bunch and the demonstration of bowing at the abdomen), and two unmistakable implications having similar sound however various spellings (bow, the demonstration of twisting at the midsection, and limb, the part of a tree). Also, it has a few related yet unmistakable implications – a bowed line is some of the time called a 'bowed' line, mirroring its likeness to the weapon.
Hence the correct answer is option ‘B'.

Note: In any event, as indicated by the most prohibitive definitions, different sets of sounds and implications of bow, Bow and limb are homonyms, homographs, homophones, heteronyms, heterographs, capitonyms and are polysemous.