The original sentence has a parallelism issue because it uses "not only" without a corresponding "but also." To correct this, we need to make the sentence grammatically parallel. Let's evaluate the answer choices:
(A) and also damage or destroy
This option maintains the non-parallel structure. It should be "not only...but also," so this choice is incorrect.
(B) as well as damaging or destroying
This choice also fails to correct the parallelism issue. It uses "as well as" which is not parallel to "not only...but also." It should be "not only...but also," so this choice is incorrect.
(C) but they also cause damage or destroy
This option introduces the word "they," which is not necessary and makes the sentence wordy. Additionally, it uses "cause damage or destroy," which is not concise. It should be "not only...but also," so this choice is incorrect.
(D) but also damage or destroy
This choice correctly uses "but also" to create a parallel structure: "not only...but also." It also uses the concise "damage or destroy." This option is grammatically correct and clear.
(E) but also causing damage or destroying
This choice introduces the word "causing," which is not necessary and makes the sentence wordy. It should be "not only...but also," so this choice is incorrect.
The correct answer is (D):
"The winds that howl across the Great Plains not only blow away valuable topsoil but also damage or destroy young plants."