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Compare Ea (activation energy) for a, b,...

Compare `E_a` (activation energy) for a, b, c and d.

A

`E_b gt E_c gt E_d gt E_a`

B

`E_a gt E_d gt E_c gt E_b`

C

`E_c gt E_b gt E_a gt E_d`

D

`E_d gt E_a gt E_b gt E_c`

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