A variable that holds the number of lightbulbs in a pack should use an integer data type because the value is a count expressed as a whole number. In programming and database contexts, integers are used for quantities that do not require fractions, such as number of items, units sold, students in a class, or days in a month.
Choosing an integer type supports efficient memory usage, accurate arithmetic for counting, and proper validation rules such as preventing non-whole values. A Boolean type would be incorrect because it can store only two states, such as true or false. Floating-point types are designed for values that may include decimals, such as measurements or scientific values, and can introduce rounding behavior that is unnecessary for simple counts. Character data is used for single symbols or letters, not numerical counts intended for arithmetic. In Information Technology best practices, selecting the most appropriate data type reduces errors and improves data integrity. Therefore, the correct data type for the number of lightbulbs in a pack is integer.