The correct answer is: C. Giving them minimum scope possible.
A variable’s scope is the part of the program where it can be accessed. A variable with a small scope is only accessible in a small part of the program, which makes it less likely to be used incorrectly.
For example, if a variable is declared at the top of a function, it can be accessed anywhere in that function. However, if it is declared at the bottom of the function, it can only be accessed within the function. This makes it less likely that the variable will be used incorrectly, because it is only accessible in a small part of the program.
The other options are not as effective at reducing unintentional errors.
- Giving a variable a small name does not make it less likely to be used incorrectly. In fact, it can make it more difficult to read and understand the code, which can lead to errors.
- Declaring a variable with a small sized data type does not make it less likely to be used incorrectly. In fact, it can make it more difficult to use the variable correctly, because the variable may not be able to store the data that it needs to store.
- Making a variable a class variable does not make it less likely to be used incorrectly. In fact, it can make it more difficult to use the variable correctly, because the variable may be accessible from anywhere in the program.