Final answer:
Option (4), In 'All Quiet on the Western Front,' Paul steps on Muller's feet because Muller has new boots, which are a valuable and coveted item among World War I soldiers.
Step-by-step explanation:
The question relates to a scene in Erich Maria Remarque's novel All Quiet on the Western Front, which describes the experiences of German soldiers during World War I. Paul Bäumer, the protagonist, intentionally steps on Muller's feet in the hospital because Muller has on new boots. Paul's action is driven by the harsh reality of frontline soldiering where resources, especially boots, are scarce and hard to come by.
The boots represent comfort and survival, as good footwear is essential for the soldiers who often are on their feet in treacherous conditions. Muller's new boots are a coveted item among the soldiers, which explains Paul's deliberate act.