After Germany surrendered to sign,the Allied Nations signed as well HOWEVER America turned against the Treaty of Versailles and this chose not to sign. A few other countries signed as well, but those were the main.
My guess is b. Muhammad tughluq...... Sorry if it's wrong but I really think it is b.
The President in the executive branch can veto a law, but the legislative branch can override that veto with enough votes. The executive branch can declare Executive Orders, which are like proclamations that carry the force of law, but the judicial branch can declare those acts unconstitutional.