what can be inferred from this chart?
a,b,c, or d

From the chart we can infer that most of the fighting in the Vietnam War took place in South Vietnam.
We can tell that most of the fighting took place in South Vietnam because:
This is corroborated by historical records because the South was the main area of operation of the Viet Cong as they fought to impose Communist rule on South Vietnam.
In conclusion, most fighting took place in South Vietnam.
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