Why is monsoon both alley and enemy in context of nepal

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It is each an enemy and best friend in the following approaches;  The Monsoon is a source of water for the irrigation within the country while it additionally causing flooding every so often. The Monsoon water is stored to produce strength however there are several casualties due to the monsoons.

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answer; i do believe its (b) 12.5 years of age;

the answer is a wheel