Answer: D. As a spy in Normandy, Baissac performed a variety of important and sometimes dangerous tasks in order to get in the way of German troops.
Option D is the option that includes most of the important information of the paragraph. Option A does not mention the kind of work that Baissac performed, or the purpose of this work. Option B does not mention the place where she did this work, or the fact that she was a spy. Option C includes most of this information, except for the fact that the work she performed was dangerous and against the Germans. Therefore, the most complete answer is D.