The excerpt reveals that the narrator has a friendly relationship with both the officers and the drivers. "He interacts easily with both his superiors and the drivers." is the right option. Heminway says that having a drink with the officers was friendly. Then, he describes a friendly moment with the drivers. He gave a packet of cigarettes to each of them and then, he smoked with the drivers.
He prefers the company of the officers to that of the drivers. Heminway does not state any preference.
He only spends time with the officers so he can get cigarettes for the drivers. He is not taking any advantage from the officers.
He looks down on everyone involved in the war, both officers and enlisted men. On the contrary, he respects all of them.