The Valley of Oymyakon in Central Siberia is Earth's Coldest Inhabited Region

Question: The valley of Oymyakon in central Siberia is Earth's coldest inhabited region; nevertheless, temperatures regularly drop below -60℃, and many residents lacking plumbing must use outdoor toilets even in mid-winter.

1. region; nevertheless, temperatures regularly drop below -60℃, and many residents lacking plumbing
2. region, with temperatures regularly dropping below -60℃; nevertheless, many residents, lacking plumbing in their homes,
3. region; nevertheless, with temperatures dropping regularly below -60℃, many residents lack plumbing, so
4. region; temperatures regularly drop below -60℃ and many residents lack plumbing, nevertheless, they
5. region; temperature drop regularly below -60℃, nevertheless, many residents lack plumbing and thus

“The valley of Oymyakon in central Siberia is Earth's coldest inhabited region”- is a GMAT sentence correction question. This particular GMAT sentence correction topic has been taken from the book ‘The Official Guide of GMAT Verbal Review’. This question checks contrast, Comparison of two subjects, elements and Modifiers. GMAT Sentence Correction questions comprise 11-16 questions to be completed within 65 minutes. Each Sentence Correction question contains a sentence with an underlined portion that includes 0-2 errors.

Answer: B
Explanation: The following concepts are tested here:

1. Modifier
2. Contrast
3. Subjects

Option A: Incorrect
The option states that - region; nevertheless, temperatures regularly drop below -60℃, and many residents lack plumbing. Putting the “and'' in the sentence produces a missing contrast. Hence, this is not the correct option. Also, the word nevertheless is not required before temperature. The effect is predictable and it just follows regularly. The addition of nevertheless is unnecessary and therefore, we can consider this incorrect. 

Option B: Correct
This optionstates that - region, with temperatures regularly dropping below -60℃; nevertheless, many residents, lacking plumbing in their homes,. The worldly meaning fits the statement and is perfect. So this seems to be the correct option. 

Option C: Incorrect
This option says - region; nevertheless, with temperatures dropping regularly below -60°C, many residents lack plumbing, so. In this option nevertheless and so together is absolutely unnecessary. So, Option C is incorrect.

Option D: Incorrect
This option has duplicate subjects: "many residents" & "they". We can see this from the option - region; temperatures regularly drop below -60℃ and many residents lack plumbing, nevertheless, they. Since there are 2 subjects, it cannot be right. So, Option D is incorrect.

Option E: Incorrect
This option misses the contrast and it is clearly not showcased. So, Option E is also incorrect.

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