The presidential power that comes from their role as chief executive is:
D. signing bills.
Explanation:
The president of the United States has several roles: Chief of State, Chief Executive, Commander in chief, etc. As Chief Executive the president can, for instance, sign bills, implement policy, prepare executive budget for the congress to approve, among other things. Notice that these actions are more intra-governmental, so to speak. They do not concern military actions or foreign affairs.
He delitberately started wars with neighbouring European countries and rallied the German people using nationalism against them and won. This is how Prussia/Germany grew large in military power and land
