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B
Natural
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C
Spontaneous
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D
Chemical mutation
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Solution
The correct option is A Induced
1) Induced mutations are alterations in the gene after it has come in contact with mutagens and environmental causes. Mutagens can be chemical(nitrous acid), radiations(x-ray) etc.
2) A mutation which occurs by itself without first being affected by a mutagen, for example during the process of DNA replication.
3) Mutation-induced by chemicals such as Nitrous acid is called chemical mutation
4) Spontaneous mutations are the mutations that are a result of natural changes in DNA structure.