Lol. Here I am.. Saying whatever the heck I want. :)
I and III only. I assume this is APES. Recycling old products reduces the usage of materials by using old ones and planting a new tree to replace every tree cut down would allow the world to continue economic developments while not exhausting forestry. II is wrong because if every adult had 3 children then a family would have 6 children and more children = more resources
I believe the answer you're looking for is "Specificity".
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Take the average of the vectors degrees. So 112.5 degrees is the direction of the resultant.