In a compiler, keywords of a language are recognized during
(A) parsing of the program
(B) the code generation
(C) the lexical analysis of the program
(D) dataflow analysis
Typically, the lexical analysis phase of compilation breaks the input text up into sequences of lexemes that each belongs to some particular token type that's useful in later analysis. Consequently, keywords are usually first recognized during lexical analysis in order to make parsing easier. Since parsers tend to be implemented by writing context-free grammars of tokens rather than of lexemes (that is, the category of the lexeme rather than the contents of the lexeme), it is significantly easier to build a parser when keywords are marked during lexing. Any identifier is also a token so it is recognized in lexical Analysis .
Hence option C is True.