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Sentence Correction: if/whether (or not)

In the American legal system, the jury have to decide whether or not the defendant is guilty.

Excellent!

This answer choice corrects the original grammatical mistake by correctly pairing the singular subject a jury with the singular verb has.

[[snippet]]

This answer choice still includes a redundancy error (whether...or not). But since B, the only answer choice which corrects this redundancy error, also includes the original grammatical error (the jury have), we must live with the redundancy.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement error, by changing the singular subject jury to the plural subject jurors, it creates a new mistake, by changing whether to if

On the GMAT, the word if is used in Conditionals only; if one thing, ...then something else. Since in this question there is no condition,if should be replaced by whether.

Whether is used as a choice between two possibilities dealing with the same subject or as a yes/no question.

ExampleI do not know whether this will work. (yes or no)

He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)

Incorrect.

While this answer choice corrects the original mistake, by changing the plural verb have to the singular verb has, it is stylistically flawed. Adding the word on after decide creates redundancy.

It is true that stylistic mistakes are not always corrected on the GMAT. However, since there is an answer choice which is both grammatically correct and stylistically superior to this one, it is preferable to this one.

Incorrect.

This answer choice repeats the original the original Subject Verb Agreement mistake. The plural subject jurors does not agree with the singular verb has.

Incorrect.

This answer choice is grammatically incorrect. The singular subject jury does not agree with the plural verb have.

[[snippet]]

Remember too: Or not after whether is redundant

Example:
Incorrect: Jane is not sure whether John is making dinner tonight or not.
Incorrect:
 Jane is not sure whether or not John is making dinner tonight.
Correct:
 Jane is not sure whether John is making dinner tonight.

the jury have to decide whether or not the defendant is guilty 
the jurors has to make a decision about the defendant's guilt
the jury has to decide on whether or not the defendant is guilty
jurors have to decide if the defendant is guilty
a jury has to decide whether the defendant is guilty or not