Arrange the following German Lagers from lightest to darkest: Helles, Dunkel, Bock, Doppelbock, Schwarzbier.

The arrangement of German lagers from lightest to darkest is determined primarily by their color and the malt used in the brewing process.

Starting with Helles, this style is a pale lager known for its light golden color. It is crisp and refreshing, making it the lightest in this group. Following Helles is Dunkel, which translates to "dark" in German. Dunkel is a darker lager that features a malty sweetness and a brown color, but it is still lighter than the stronger styles that follow.

Next in line is Bock, which is a stronger German lager that can range from light copper to darker amber shades, though it is not as dark as some of the darker styles. Doppelbock is an even stronger version of Bock, often approaching a darker profile but still generally classified within the amber to brown hue range.

Finally, Schwarzbier, or "black beer," is the darkest lager in this list, characterized by its rich, dark color and roasted malt flavors.

Thus, the correct sequence from lightest to darkest is Helles, Dunkel, Bock, Doppelbock, and Schwarzbier, which is accurately represented in the given answer choice.