Answer:
C.
“If there is any practical use for helium other than medicine, laws should change to protect current supplies of the gas.” This sentence summarizes one of the major points of the argument, which is that helium reserves are in low supply.
The maintenance of a high moral in any army is a critical factor for its performance. At the moment that Washington selected Valley Forge as the location for his army's winter camp; his army was not equally trained and not well equipped as the British were. So selecting that location made easier for Washington's army to keep a good supply source, a shelter for extreme winter conditions and also a close location from British lines in order to make and prevent incursions.
