The correct answer is C. background.
The background property sets the background color, image, and repeat of an element. It can be used to set any or all of the following background properties:
- background-color: The color of the background.
- background-image: The URL of an image to use as the background.
- background-repeat: How the background image should be repeated.
- background-position: The position of the background image.
- background-attachment: How the background image should scroll with the page.
- background-clip: The area of the element that the background image should be clipped to.
- background-origin: The origin of the background image.
- background-size: The size of the background image.
The background property can be used in shorthand form to set multiple background properties. The shorthand form is as follows:
background: <color> | <image> | <repeat> | <position> | <attachment> | <clip> | <origin> | <size>;
The order of the properties in the shorthand form is not important. For example, the following two declarations are equivalent:
background: red url(image.png) repeat-x;
background: url(image.png) red repeat-x;
The background property can also be used to set multiple background images. To do this, you can separate the images with commas. For example, the following declaration sets two background images:
background: url(image1.png), url(image2.png);
The background images will be stacked on top of each other, with the first image in the list being on the bottom. You can control the order of the images by changing the order in the list.
The background property is a powerful tool that can be used to create a variety of background effects. By understanding the different properties that can be set, you can create backgrounds that are both visually appealing and functional.