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The publication of the patient satisfaction survey shows a significant improvement in general satisfaction scores, which had risen by over 16 points after it reached an all time low in the previous year.
While this answer choice corrects the original mistakes, it is stylistically flawed.
The use of the phrase with a rise of over 16 points is awkward and confusing. By eliminating the relative pronoun which, which clearly modifies scores, it is not clear what a rise refers to.
Further more, while correct, the construction having reached is also unnecessarily awkward and redundant.
This answer choice is grammatically incorrect. The singular pronoun it does not agree with the noun it refers to, which is plural (scores).
Moreover, in the sentence, a past action (scores...reached an all time low) takes place before another past action (scores...had risen by over 16 points), but the Past Perfect (had risen) is incorrectly used for the later action, rather than for the earlier action.
While this answer choice corrects the original mistakes, it is ambiguous and hence stylistically flawed. It is unclear whether rising by over 16 points refers to the publication, the improvement, or the scores.
There is another answer choice which conveys the meaning of the sentence in a clearer way. Find it!
While this answer choice corrects the original mistakes, it is grammatically incorrect and illogical. The singular verb is does not agree with the plural noun scores, to which it refers.
Moreover, even if the correct verbal form were used (e.g. which are a rise), this would be illogical, as the scores cannot be a rise. The scores can either rise themselves (rise=verb), or reflect a rise (rise=noun).
This answer choice corrects the Pronoun Agreement mistake in the original question, by changing after it reached to after reaching. It corrects the Tense mistake by changing Past Perfect had risen to Present Perfect have risen.
This answer choice corrects the Pronoun Agreement mistake in the original question, by changing after it reached to after reaching.
It corrects also the tense mistake by changing the Past Perfect had risen to the Present Perfect have risen. The use of the Present Perfect is appropriate here to describe an action that began in the past and is still relevant in the present.