Answer:
or 
Explanation:
Number of longitudes on Earth = 
In one hour the Earth rotates 
So,
takes 

Since the longitude is in the East the time difference will be added.
So, if it is noon in Greenwich the time at 100 degree East will be
or
.
C
What was one effect of the development of agriculture in South America?
A.
More people moved to the Grand Chaco.
B.
Groups began to settle in one place.
C.
People had less food to eat.
D.
People wore more animal skins and furs.
Plateau because of the fresh water I think
You didn't list the options to choose from but I found them elsewhere.
The answer is - couples in happy marriages make external attributions for negative behavior and internal attributions for positive behavior; while couples in unhappy marriages make internal attributions for negative behavior and external for positive. Happy couples blame outside forces for issues whereas unhappy couples blame each other.