Which data type is used for storing negative or positive decimal values?

The correct choice for storing negative or positive decimal values is the floating-point data type. This data type is particularly designed to handle real numbers, which include fractions and decimal values, allowing for a representation of both small and large numbers with considerable precision. Floating-point numbers can include both positive and negative values, accommodating a wide range of mathematical computations that require decimal points.

In contrast, integers are used solely for whole numbers, character types store single characters or letters, and strings represent sequences of characters, which can include letters, numbers, and symbols but are not suited for mathematical calculations that involve decimal points. Therefore, floating-point is the most appropriate data type for this requirement.