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that most doctors prescribe costly drugs rather than prescribing those recommended by government guidelines, forcing consumers to spend more than they need to.

They should more their necessity. It is more correct to say should.

I work more than I should NOt I need.........
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ShaikhMoice
Could anyone shed some light why C is incorrect.
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In C, prescribe and prescribing are not parallel. "Prescribe" is a verb while "prescribing" is a present participle adjective.
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ShaikhMoice
Could anyone shed some light why C is incorrect.
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Hello ShaikhMoice,

We hope this finds you well.

To answer your query, Option C incorrectly uses the present participle ("verb+ing" - "prescribing" in this case) to refer to habitual action.

Please remember, habitual actions are best conveyed through the simple present tense.

We hope this helps.
All the best!
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