In most animals,the metabolic reactions proceed in a $A$ temperature range (in humans,it is $37^{\circ} C$). But there are microbes (archaebacteria) that flourish in hot springs and deep sea hydrothermal vents where temperatures far exceed $B$. Choose the correct option for $A$ and $B$.

  • A
    $A-$narrow; $B-100^{\circ} C$
  • B
    $A-$broad; $B-100^{\circ} C$
  • C
    $A-$median; $B-100^{\circ} C$
  • D
    $A-$broad; $B-40^{\circ} C$

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