Final answer:
The false statement among the options is c. Setting a node's Pref Width property of a Grid Pane column to USE_COMPUTED_SIZE does not base solely on the 'widest' child but computes the size including all children.
Step-by-step explanation:
The student has asked which statement is false among the given options related to setting up a user interface in a particular software framework, likely from a software development or computer programming context.
Option a suggests you can set a Button's text in two ways which is true, through the design interface by double-clicking on it or by setting its Text property in the code Inspector window. Option b states that a Grid Pane column's contents are left-aligned by default, which is also true as per the default behavior of a Grid Pane in many UI frameworks. Option c, however, is the false statement. Setting a node's Pref Width property of a Grid Pane column to USE_COMPUTED_SIZE does indicate that the size should adjust to its children, but it does not specifically base on the 'widest' child. Instead, it computes the size based on all children and other factors like minimum and maximum width constraints.