Final answer:
The correct choice to correct the underlined portion of the sentence is: 'While that is true, there'.
Step-by-step explanation:
The correct choice to correct the underlined portion of the sentence is: While that is true, there. This choice maintains the logical flow of the sentence and correctly signals a contrast in information. The phrase 'While that is true' introduces a contrasting idea to the previous statement, emphasizing that although the previous statement may be true, there is still a demand for real products created by the manufacturing industry.
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