Final answer:
In a graphics software, after creating color-named groups for squares, to hide the green group, the correct action would be 'Object > Hide'. This hides the selected group, unlike other options that group, rearrange, or lock objects. Option d.
Step-by-step explanation:
To group squares based on their color and name the groups accordingly in a graphics software, one would typically use the grouping feature. After creating groups named green, magenta, and blue, to adhere to the instructions of hiding the green group, the correct option would be:
d) Object > Hide
This is because this particular option would hide the selected object or group, which in this case, is the group of green squares.
The other options, such as Object > Group, would be used to create the group initially, while Object > Arrange > Send to Back or Object > Lock have different functions related to layer arrangement and locking objects, respectively.
So Option d.