The property ________ in a Container widget can be used to adapt its size responsively based on screen width.

In a Flutter Container widget, the constraints property allows you to set constraints on the widget's size. By using the BoxConstraints class, you can define minimum and maximum width and height values. To make a Container adapt its size responsively based on screen width, you can utilize the MediaQuery class to get the current screen width and then set the constraints accordingly. This approach enables dynamic adjustments to the Container size, ensuring a responsive layout.