Answer :
The given CSS snippet "p font-family: serif;" changes the font of all paragraphs in the HTML document to a serif font.
Option A is the answer.
This CSS snippet specifically targets the paragraph elements (denoted by 'p') and sets their font-family property to serif. This means that any text enclosed within paragraph tags in the HTML document will be displayed using a serif font.
Serif fonts are characterized by small decorative strokes or tails at the ends of characters, and they are commonly used for body text due to their readability. Therefore, this statement accurately describes the effect of the CSS snippet on the paragraphs in the HTML document.
Option A is the answer.