The energy profiles for four different reactions are shown below. The scales are the same for each. Which reaction requires the most energetic collisions to reach the transition state? 
Definitions:
Nondirectional Correlation
A type of correlation where the direction (positive or negative) of the relationship between variables is not specified.
Statistically Significant
A determination that an observed effect in a study is unlikely to have occurred due to chance alone.
Causality
The relationship between cause and effect, where one event (the cause) is understood to directly result in the occurrence of another event (the effect).
Probability Level
The likelihood or chance that a particular event will occur, often measured by a numerical value ranging from 0 (impossibility) to 1 (certainty).
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