Given below are the statements regarding enzymes. Choose the correct statements.
$i$. All enzymes are proteinaceous.
$ii$. Enzyme becomes more active at the temperature of $60^{\circ}C$ to $70^{\circ}C$.
$iii$. Enzymes have one or two active sites where substrate binds with the enzyme.
$iv$. Any increase or decrease in specific $pH$,enzyme activity is always enhanced.
$v$. Enzymes remain active to catalyze again after completion of first reaction.

• A
  $ii$ and $iv$ only
• B
  $i$ and $v$ only
• C
  $i, iii$ and $v$ only
• D
  $ii, iii$ and $v$ only