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generis
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Genetics-based drugs, an emerging class of medications, are likely to be tailored at least in part to individuals; as a result, drug companies will probably try and charge patients made-to-measure prices.

Lets analyze each & every part of the sentence.

* Subject Verb Agreement

[ "Genetics-based drugs- are likely" ; "drug companies - will"]
- All subjects have verb pair and makes sense. Correct

* Tense Form

[ Present & Future Tense]
- first sentence is in present tense and 2nd one is in future tense. Both tense conveys intended meaning.Seems okay.

* If-then condition

- not used

* Subjunctive Verb

- not used

* Pronoun

- not used

* Modifier

[ "an emerging class of medications" modifies "Genetics-based drugs"]
- modifier " an emerging class of medications" modifies the subject logically.

* Parallelism

[ drug companies will probably try "and" charge patients]
- parallelism marker "and" connects to verbs " try " & "charge" but it makes no sense that one company first try & then charge. That makes illogical. Incorrect.

* Comparison

- not used

* Idioms

[ "as a result of" ]
- "as a result of" used correctly.

While analyzing the whole sentence, only parallelism error is identified but that is only logically otherwise grammatically that is also okay.

A) will probably try and charge

- parallelism error; grammatically okay but logically seems inappropriate.

- Incorrect


B) have probably tried to charge

- "have tried" means that required action is started from the past and still continues, which changed the meaning of the sentence.

- Incorrect

C) probably try and charge

- it simply uses the present tense but it loose the contrast which is required in original sentence.

- Incorrect

D) probably try charging

- "charging" modifies "try" which makes sentence redundant.

- Incorrect

E) will probably try to charge

- it removes all the error and properly conveys the intended meaning of the sentence.

- Correct.

IMO(E)
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The official answer is here.
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