Step 1: Understanding the Concept:
Overrun is the volume of air incorporated into ice cream during the freezing process, expressed as a percentage of the volume of the original liquid mix.
Air is necessary to give ice cream its characteristic light, smooth, and scoopable texture.
Step 2: Detailed Explanation:
Different types of ice cream have different overrun standards to achieve their desired textures:
- Standard commercial hard-pack ice cream typically has an overrun of 80% to 100%, making it light and airy.
- Soft-serve ice cream is drawn from the freezer at a higher temperature (around $-6^\circ$C) and consumed immediately without hardening.
To maintain its characteristic thick, creamy, and flowing consistency directly from the dispensing nozzle, soft-serve ice cream requires less air incorporation.
The overrun associated with soft-serve ice cream is typically kept low, usually in the range of 30% to 45%, with 25% being a standard lower limit or representative value.
An overrun as high as 80% or 95% would make the soft-serve too light, cause it to melt too quickly, and lead to structural collapse when extruded.
Therefore, 25% is the correct overrun value associated with soft-serve ice cream among the options.
Step 3: Final Answer
The correct option is (A).