Which of the following Overflow property value is described by scrollbars should be provided if the content is too big, but actual implementation is left up to the browser?

The correct answer is C. auto.

The overflow property specifies how the content of an element is displayed if it overflows its box. The possible values are:

• visible : The content is visible, even if it overflows its box.
• hidden : The content is hidden if it overflows its box.
• scroll : The content is visible, and scrollbars are provided if necessary.
• auto : The browser decides whether to use visible or scroll based on the content of the element.

In this case, the question is asking which of the following values is described by scrollbars should be provided if the content is too big, but actual implementation is left up to the browser. The answer is auto, because auto tells the browser to use visible or scroll based on the content of the element.