Identify the incorrect statement.
$I$. Speciation is generally a function of time.
$II$. Tropical environment is less seasonal,relatively more constant and predictable.
$III$. Solar energy contributes to high productivity.
$IV$. Temperate regions have remained relatively undisturbed for millions of years.

• A
  $I, II, III, IV$
• B
  $II, III$
• C
  Only $IV$
• D
  $III, IV$