Which two lines in this excerpt from guy de Maupassants short story boule de sulf show that relations between most French and german people remained friendly despite the war

In many houses the Prussian officer ate at the same table with the family.

... in the house both chatted freely, and each evening the German remained a little longer warming himself at the hospitable hearth.  

Explanation:

The excerpt you were given is the following:

At the end of a short time, once the first terror had subsided, calm was again restored. In many houses the Prussian officer ate at the same table with the family. He was often well-bred, and, out of politeness, expressed sympathy with France and repugnance at being compelled to take part in the war. This sentiment was received with gratitude; besides, his protection might be needful some day or other. By the exercise of tact the number of men quartered in one's house might be reduced; and why should one provoke the hostility of a person on whom one's whole welfare depended? Such conduct would savor less of bravery than of fool- hardiness. And foolhardiness is no longer a failing of the citizens of Rouen as it was in the days when their city earned renown by its heroic defenses. Last of all-final argument based on the national politeness—the folk of Rouen said to one another that it was only right to be civil in one's own house, provided there was no public exhibition of familiarity with the foreigner. Out of doors, therefore, citizen and soldier did not know each other; but in the house both chatted freely, and each evening the German remained a little longer warming himself at the hospitable hearth.

The lines that show how friendly relations between French and German people remained despite the war are the following:

In many houses the Prussian officer ate at the same table with the family.

... in the house both chatted freely, and each evening the German remained a little longer warming himself at the hospitable hearth.  

During the war, in which Germany invaded France, the French had to take in German officers and decided to offer them their hospitality. They fed them well and treated them as guests, building a peaceful relationship despite the war.

the answer is a (apex)