Critical Thinking Questions Ben Has Been Assigned the Task of Restyling

Critical Thinking Questions Ben has been assigned the task of restyling the website of a leading fashion brand. Ben observes that the content on the webpages are not grouped together due to which the website receives low search engine results.
After the grouping of all the areas together, Ben wants to specify a bottom padding of 3em for the section element. Which of the following style rules is the correct form of specifying bottom padding for a section element?

A) section {          bottom : 3em;
        }
B) section {          padding-bottom: 3em;
        }
C) section {          bottom-padding: 3em;
        }
D) section {           bottom: 3em;
        }