How to get back to previous page with no data lost in c# windows form application?

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)

While inserting images, the picture command is usually used to insert photos from a digital camera, and the clip art command is usually used to a.edit the sizes and other characteristics of photos that have been inserted. b.take a screenshot of an image and copy it to the clipboard for pasting. c.search for drawings or other images from a library of prepared pictures. d.make illustrations using lines and shapes that are easy to manipulate.

You can apply several different worksheet themes from which tab?