Step 1: Understanding the Question:
The question asks for the definition of "Sandhi" within the context of Sanskrit grammar. It specifically asks what elements are joined according to the rules of Sandhi.
Step 2: Key Formula or Approach:
This is a knowledge-based question about a specific concept in Sanskrit grammar. The approach is to define Sandhi and match its definition with the given options.
Step 3: Detailed Explanation:
The term "Sandhi" (संधि) literally means "joining" or "union" in Sanskrit. In grammar, it refers to the set of rules that govern the euphonic changes that occur to sounds when two letters (varnas) meet at the junction of words or morphemes. It is a process of sound combination that makes speech smoother and more melodic.
For example, when `deva` (देव) and `indra` (इन्द्र) are joined, the final `a` of `deva` and the initial `i` of `indra` combine to form `e`, resulting in `devendra` (देवेन्द्र). This is a change at the level of sounds and letters.
Analyzing the options:
(A) Words and sentences: This is too broad. Sandhi happens at a lower level.
(B) Letters and sounds: This is the precise definition of Sandhi.
(C) Nouns and verbs: These are parts of speech, not the elements Sandhi operates on directly.
(D) Prefixes and suffixes: While Sandhi rules apply when they are joined, the fundamental process is about letters and sounds.
Step 4: Final Answer:
Sandhi in Sanskrit refers to the joining or combination of letters and sounds. Therefore, option (B) is correct.