Archaebacteria which are seen at extremely high temperature and acidic pH are

Methanogens

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Thermoacidophiles

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Halophiles

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Ruminant symbionts

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Solution

The correct option is A Thermoacidophiles
A thermoacidophile are the organisms which are adapted to survive at high temperatures and acidic pH. Thermoacidophiles generally prefer the temperature range of about 70 - 80 $^{o}$ C and pH between 2 and 3. They are found in the hot springs and thermal vents.
Thus, the correct answer is option B.

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