The answer is D.
Factor production that could be changed during particular period is called Variable Factor of Productions.
Basically, factor of productions is divided to fixed and variable factor.
FIxed factors are the one that will always stay the same no matter how many products you made. For example electricity cost, building rent, etc
The variable factors differ depend on how product you produce, such as raw material.
<span>In America’s version of federalism, power is shared b</span>etween the state and federal governments.
<span>Slavery is often considered the "cause without which" the Civil War would not</span>
Lawmakers use newsletters, websites, email, town meetings and polls to stay in touch with voters opinions. I hope that this is the answer that you were looking for and it has helped you.
Answer should be D. National Security. because National Security is a concept <span> that the government should protect its citizens</span>
