The correct answer is D — Germania.
Germania was the allegorical female figure representing the German nation, wearing a crown of oak leaves symbolising heroism, as described in the textbook.
The textbook (Chapter 1) clearly states that Germania became the allegory of the German nation, shown wearing a crown of oak leaves. Marianne represented France, Britannia represented Britain, and Helvetia represented Switzerland. In MCQs on allegorical figures, remember the nation each symbol stands for.