Which of the following does not act as a doomsday device?
a. The practice of programming into a computer the price above which an alternative supplier will be used
b. A bank robber demanding the money in five minutes and then lighting a five minute fuse on a bomb
c. Promising to marry someone and giving a $5000 engagement ring
d. A student promising not to cheat on a take-home test
Answer: d. A student promising not to cheat on a take-home test