The correct answer is cohesion.
Cohesion is a measure of how well the operations in a function relate to one another. A function with high cohesion has operations that are closely related and that work together to achieve a common goal. A function with low cohesion has operations that are loosely related and that do not work together very well.
Coupling is a measure of how strongly the operations in a function depend on each other. A function with high coupling has operations that depend on each other very strongly. A function with low coupling has operations that depend on each other very weakly.
Adhesion is a measure of how well the functions in a system relate to one another. A system with high adhesion has functions that are closely related and that work together to achieve a common goal. A system with low adhesion has functions that are loosely related and that do not work together very well.
Conversion is a process of changing one thing into another. In the context of software engineering, conversion can refer to the process of changing one type of data into another type of data, or the process of changing one programming language into another programming language.
In conclusion, the measure of how well the operations in a function relate to one another is cohesion.