You want to add a symmetry constraint between pairs of curves already created in your sketch. Which command would you use?

The command to use for adding a symmetry constraint between pairs of curves in your sketch is "Make Symmetric." This command specifically allows you to create a symmetric relationship between selected entities, such as curves or points, around a defined axis. When you apply this constraint, any modifications to one of the curves will automatically reflect symmetrically in the other, ensuring that they maintain the intended geometric relationship.

The other options serve different purposes: "Mirror Curve" is used to create a mirrored copy of a selected curve rather than establishing a symmetry constraint. "Move Curve" allows for the repositioning of a curve but does not create any relationship between curves. "Pattern Curve" is intended for creating multiple instances of a curve in a specified pattern instead of enforcing symmetry between two existing curves.

In summary, "Make Symmetric" is the appropriate choice as it directly establishes the necessary geometric relationship of symmetry between the curves in the sketch.