The correct answer is: B. margin
The margin property sets the space between an element and its parent element or the outer edge of the viewport. It can be set on all four sides of an element, or on a specific side.
The border property sets the width and style of the border around an element. It can be set on all four sides of an element, or on a specific side.
The padding property sets the space between the content of an element and its border. It can be set on all four sides of an element, or on a specific side.
Here is an example of how to use the margin property to set a consistent margin on all four sides of an element:
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The output of the above code would be a div element with a margin of 10px on all four sides, as shown in the following image:
I hope this helps!