I would go for (3) A shortage of military supplies and
food...
This also because the first sparks of rebellion came from the army after the terrible
sufferings of the soldiers (killed by the hundred thousands because of poor
directions from the officers and almost no supply in the field). It is interesting to
remember that the famous "Cruiser Potemkin" mutiny was started (allegedly)
by the distribution to the sailors of rotten meat!
