which line will change the font family to serif

Answer 1

To change the font family to serif in CSS, you would typically use the following line of code:

font-family: serif;

You can apply this style to an HTML element like this:

<p style="font-family: serif;">This text will be displayed in a serif font.</p>

Alternatively, if you're using a CSS stylesheet, you could define it like this:

p {
    font-family: serif;
}

This will change the font family of all paragraph (<p>) elements to a serif font.