Which of the following correctly declares a variable with the constant value for gravity?

The declaration of a variable that represents a constant value for gravity is correctly done by using the keyword "final" in the context of the Java programming language, which is often used in courses like CSE110. The keyword "final" indicates that once the variable is assigned, its value cannot be changed.

In option A, "final double GRAVITY = 9.81;", the variable GRAVITY is declared as a constant of type double, with the value of 9.81. This aligns with best practices in programming for defining constants, particularly in Java, where it's common to use uppercase letters for constant variable names, making them easily identifiable.

Additionally, while the other choices might seem similar, they either incorrectly use the order of the keywords, do not follow the conventions of the language being dealt with, or use incorrect keywords such as "const," which is not recognized in Java. This reinforces why the first choice is the correct declaration for a constant gravity value in this context.