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B, C, E. GNOME, KDE, and Xfce are all Linux desktop environments, so options B, C, and E are all correct. (Others include LXDE and Unity.) The GIMP Toolkit (GTK+) is a GUI programming library. Although GNOME and Xfce are both built atop GTK+, it's not a desktop environment, so option A is incorrect. Evolution is a Linux email client, not a desktop environment, so option D is incorrect.
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