The nearest meaning of SCALING is:

C. Calculating

Here’s why:

• Scaling can have several meanings, but some of the most common involve:
• Adjusting something according to a scale: This could involve increasing (scaling up) or decreasing (scaling down) something based on a specific reference point.
• Measuring something: This can involve using a scale (like a ruler) or a system of measurement.
• Calculating involves making a measurement or estimation, which aligns with the concept of using a scale or adjusting something based on a reference point.

Here’s how the other options compare:

• Decrease – This refers specifically to making something smaller or less. Scaling can involve increasing or decreasing.
• Descend – This means to move down, which is not always the case with scaling.
• Fall – This means to drop or collapse, which is the opposite of scaling.