The Font dialog box in Microsoft PowerPoint provides a variety of text formatting options.
Let's check the availability of the effects listed:
(A) Underline: This is a standard font effect available in PowerPoint, allowing you to place a line under the text.
(B) Strikethrough: This is a standard effect that draws a line through the middle of the text. It is available in the Font dialog box.
(C) Shadow: This effect adds a shadow behind the text, giving it a 3D appearance. It is available in the Font dialog box.
(D) Emboss: This effect makes the text appear as if it is raised from the surface. While some older versions or different software might have had this, in modern versions of PowerPoint, this specific Emboss effect is not a standard option in the main Font dialog box. Similar effects can be achieved through Text Effects in the Format Shape pane, but it's not a direct checkbox option like the others.
Therefore, Emboss is the effect not readily available in the standard font dialog box.