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Sentence Correction: Parallelism - not only A but also B

Not only gas stoves but also electric stoves provide an excellent solution for cooking purposes although more gas stoves are being bought by consumers.

Although this answer choice is grammatically correct, it is stylistically flawed. The second part of the sentence uses the passive (are being bought) instead of active and doing so creates redundancy. Since there is another grammatically correct answer choice that doesn't use the passive form, it is preferable to this one.

Although this answer choice is grammatically correct, it repeats the original Stylistic flaw. The beginning of the sentence uses the passive (are being bought) instead of active and doing so creates Redundancy. Since there is another grammatically correct answer choice that doesn't use the passive form, it is preferable to this one.

Although this answer choice corrects the original Stylistic error by changing the second part of the sentence from passive to active, it is grammatically incorrect. Not only must be followed by but also, not but and too.

What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign:

not only... but also...

Although this answer choice corrects the original Stylistic error by changing the second part of the sentence from passive to active, it is grammatically incorrect. But also must be preceded by not only.

What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign:

not only... but also...

Nice!

This answer choice corrects the original Stylistic error by changing the second part of the sentence from passive to active.

Not only gas stoves but also electric stoves provide an excellent solution for cooking purposes although more gas stoves are being bought by consumers
Not only gas stoves but electric stoves provide an excellent solution for cooking purposes too although more consumers buy gas stoves
Although more gas stoves are being bought by consumers, not only gas stoves but also electric stoves provide an excellent solution for cooking purposes
Not only gas stoves but also electric stoves provide an excellent solution for cooking purposes although more consumers buy gas stoves
Gas stoves but also electric stoves provide an excellent solution for cooking purposes although more consumers buy gas stoves