You have 2 places where to map properties and controls.
In the property form itself (Display & Validation)
This is where you tell what control to use by default when using the property in a cell. (Answer D
In the cell of a layout in a section.
This is where you can use the "inherited from property" or use the same control as defined in the property form or, use another control that then will override the control defined in the property form. (Opposite of answer C)
I have a property "Age" which is an interger that had Display & Validation as pxInteger. Now i added it to a section and changed the control to Dropdown but even Display & Validation part of the property is still pxInteger. It didn't change.