That statement is true.
Object permanence is a very important step in a child development. It requires the capability to create a mental representation about that specific object.
This very development make the children understand that their parents do not actually disappear when they're playing a peek-a-boo
America was the only major industrial nation that was not devastated by war. The economy benefited from an expanding internal market and heavy investment in research and development
An arbiter is consulted when neither side can agree to move forward. The correct option among all the options given in the question is option "a". An arbiter is the only option left for those people that cannot reach a solution amicably. The arbiter is the neutral person who takes a decision on behalf of the two people.
