The theme color scheme of the slide can be changed by clicking on the next to the color button, located in the group. (Microsoft Excel 2013)

A) drop-down arrow, Animation
B) drop-down arrow, Themes
C) drop-down arrow, Background
D) drag and drop menu, Themes

B) drop-down arrow, Themes

Explanation:

An Excel theme consists of a collection of colors, fonts, and effects that can be applied to a slide to add beauty. Themes make work to be professional, consistent and make adhering to design guidelines easy.

To change theme color, first open a Blank Workbook.  Secondly, On the Page Layout tab, in the Themes group, click Themes drop down arrow beside the color button.

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