Answer:
Normally its the pleasure of doing so or they are just in need of something (i.e. robbing a bank-in need of money). Most people who do something wrong to get something they want do it for the thrill or the pleasure.
It is an example of a plot complication. The reader is surprised to learn that Jim has sold his watch to buy Della the hair combs.
I'd say d is the answer. By chemical attack, it is specifically a gas attack. Gas masks, all buy one is able to put on their gas masks. Presumably that one guy died. B is definitely incorrect.
