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Sentence Correction: Subject Verb Agreement - X of Y Subject

The principles of political morality was the subject of a speech given by Maximilien Robespierre in February 1794.

Incorrect.

This answer choice repeats the Subject Verb Agreement mistake in the original question. The singular verb was does not agree with the plural subject the principles

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In addition, this answer choice changes the meaning of the original sentence by changing the last word from by to to.  

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, it changes the meaning of the original sentence by changing the last word from by to to.

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Well done!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the singular verb was to the plural verb were, to match the plural subject The principles.

[[snippet]]

Incorrect.

This answer choice repeats the Subject Verb Agreement mistake in the original question. The singular verb was does not agree with the plural subject the principles

[[snippet]]

Incorrect.

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

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was the subject of a speech given
was the subject of a speech delivered
were the subject of a speech given
were the subject of a speech given to
was the subject of a speech given to