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Sentence Correction: Subject Verb Agreement - A Pseudo-Plural Singular Subject

Bioethics are the philosophical studies of the ethical controversies brought about by advances in biology and medicine. 

Excellent!

This answer choice corrects the original grammatical mistake. The singular subject Bioethics does not agree with the plural verb are. This error is corrected by replacing are with the singular verb is.

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Incorrect.

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

[[snippet]]

Incorrect.

This answer choice repeats the original mistake. The singular subject Bioethics does not agree with the plural verb are.

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In addition, this answer choice doesn't fit into the original sentence, because it omits the word about.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake, it is illogical. Since bioethics is singular, it cannot be said to be 'philosophical studies', which is plural.

Furthermore, adding the words which were creates redundancy.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake, it is illogical. Since bioethics is singular, it cannot be said to be 'philosophical studies', which is plural. 

are the philosophical studies of the ethical controversies brought about
are the philosophical study of the ethical controversies brought
is the philosophical study of the ethical controversies brought about
is the philosophical studies of the ethical controversies which were raised
is the philosophical studies of ethical controversies generated