HMC wrote:
I am unable to understand why the option with OR is wrong... The World War II may be caused by any of them ... or all of them happening at that time.
Somehow I am unable to find a fault with option using OR...
The problem with D is the faulty use of the gerund "rising". If an action noun is already available, the the use of gerund is uncalled for. Hence the noun "rise" is better than the gerund. Manhattan SC guide has a detailed discussion on simple gerund and complex gerund.
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