2points
causation describes a relationship between two events in which:
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a. one event directly triggers the other.
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b. one event is more important than the other.
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c. both events occur at the same time.
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d. both events are historical turning points.

Causation describes a relationship between two events in which "one event directly triggers the other".

Option A

Explanation:

Causation is the phenomenon in which one event is responsible for the another event, in such a way that both the events have casual relationship. From historical point there were many event like slavery, racism etc, which are responsible for causing World War I.

Causal analysis, also called causal research, is research into the relationships between cause and effect. It is necessary to analyse variation in the assumed variable to cause the variation in the other variable with intention of  determining causality.

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.