Outside it was getting dark. i asked what time the attack was to be and they said as soon as it was dark. i went back to the drivers. they were sitting in the dugout talking and when i came in they stopped. i gave them each a package of cigarettes, macedonias, loosely packed cigarettes that spilled tobacco and needed to have the ends twisted before you smoked them. manera lit his lighter and passed it around. what about the actions of these men exemplifies them as hemingway heroes?
they talk about the oncoming attack, clearly with a deep sense of worry for their own safety and the safety of others.
they have not yet lived through a battle and are naive about the imminent danger that awaits them.
they have the bond only men in battle can share, and this is related by the way they partake of the cigarettes.
they act casually and go about regular business, such as smoking, while actually in grave danger.

I would contend that the right answer is the D) They act casually and go about regular business, such as smoking, while actually in grave danger.

Explanation: Just to elaborate a little on the answer, it can be added that option A should be discarded, since, although they might have been talking about the attack before Frederick Henry arrived, that information is not revealed to the reader in this passage, and the fact that they accepted the cigarettes and went ahead and lit them does not suggest that they were worried about their safety. In addition, Hemingway heroes tend to be very individualistic, and they are neither naive nor inexperienced, so options B and C can also be discarded. The drivers, much like other characters in the novel, felt ambivalent towards the war, but they also knew what their duties were, and they were ready to handle the dificult situation that they were about to experience, hence their casual attitude hours or minutes before the attack. Another trait of Hemingway heroes is a refusal to show emotions.  

umm i have no idea what that is good luck : )

no its not a run on sentence however i think you meant wet suits not sours also a run on sentence would be like surfers surf all winter long in southern california by using wet sours to keep them warm and the live their all year long