Final answer:
Option A. 77 is a literal, which is a notation for representing a fixed value in source code. Other options such as main, int, and salary refer to identifiers or keywords, and + is an operator.
Step-by-step explanation:
The question which one among the options (A. 77, B. main, C. int, D. +, E. salary) represents a literal can be answered by understanding what a literal is in the context of programming. A literal is a notation for representing a fixed value in source code. In various programming languages, literals may represent numerical values, characters, strings, or boolean values.
In the given options, A. 77 is the only choice that is a literal. This is because 77 is a specific numeric value that does not change. It is directly written in the code as a fixed number. On the other hand, main, int, and + are not literals. The identifier 'main' typically refers to the starting point of a program in languages like C and C++. The keyword 'int' is used to specify a data type for integer variables, and the symbol '+' is an operator used for addition. Lastly, 'salary' could be the name of a variable that stores a value, which indicates that it would be an identifier and not a literal.