A written constitution is important because it limits the overall power of rulers or people with power, and stops them from creating any laws or policies that can be deemed unjust. Imagine a government in which the ruler can be appointed for life and create any law or do whatever he wants. That's why our founding fathers wrote this. To make sure the reason they left Great Britain could never happen in our own government.
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When they traveled, they carried cheap luggage, which were called carpetbags. They were mass produced during this time (reconstruction era) and therefore, the many people coming down with them from the north were referred to derisively as carpetbaggers.
B. It was to aid Europe after WWII
First, an unskilled worker can be easily replaced but another factor would be for the simple fact the manager most likely has the most experience in the field.
2 is the only one I would go with