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Option 2 : 2
The error is in the second part of the sentence.
The general tense of the sentence is present tense while the tense in the second part of the sentence is past tense. Hence, required change must be made. The verb ‘could’ must be replaced with ‘can’ to make the sentence grammatically correct.
Therefore, the correct sentence will be: Radium is so expensive that you can be a millionaire if you own only half a pound of it!
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