Which of the following is an example of a quantitative data type?

Quantitative data refers to information that can be measured and expressed numerically, allowing for mathematical operations and statistical analysis. Sales figures are a clear example of quantitative data because they are expressed in numbers, representing measurable quantities such as the number of units sold or the revenue generated in a specific period. This type of data allows for various analyses, such as calculating averages, making comparisons, or identifying trends over time.

In contrast, the other choices pertain to categorical data types, which are descriptive and cannot be used for mathematical operations. For instance, colors of cars, brands of smartphones, and types of music genres all represent categories that can distinguish one group of items from another but do not have inherent numerical values attached to them.