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Option 2 : 2
Part 2 has an error because it doesn't observe agreement of the verb with the subject.
Whenever two nouns are joined by 'each of', they take a singular verb.
Here, the verb used is 'have'- a plural verb- which is incorrect.
The correct sentence will be 'Each of these metals has been discovered in abundant quantities in the country'.
Thus, the correct answer is Option 2.
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