Which statement about the Lock Formula option in the Expressions dialog box is true?

The statement that the Lock Formula option in the Expressions dialog box is particularly useful for protecting important expressions from being modified is accurate. This feature allows users to safeguard specific expressions that are critical to their design, ensuring that they remain unchanged during further modifications or updates to the model. By locking an expression, designers can prevent accidental alterations, which can help maintain consistency and prevent errors in the design process.

The Lock Formula option is not about automatically locking all expressions, as it is a selective feature that requires the user to apply it to specific expressions of their choosing. It is also versatile, not limited strictly to numerical expressions since it can apply to various types of expressions within the design environment. Regarding its default state, it is not necessarily disabled by default since this depends on the user's preferences and settings, meaning that it may vary from one instance to another. Thus, option B is the most accurate and relevant in the context of the functionality of the Lock Formula.