Which of the following environmental conditions are essential for optimum growth of $Mucor$ on a piece of bread?
$A.$ Temperature of about $25^{\circ}C$
$B.$ Temperature of about $5^{\circ}C$
$C.$ Relative humidity of about $5\%$
$D.$ Relative humidity of about $95\%$
$E.$ $A$ shady place
$F.$ $A$ brightly illuminated place
Choose the answer from the following options.

• A
  $B, C$ and $F$ only
• B
  $A, C$ and $E$ only
• C
  $A, D$ and $E$ only
• D
  $B, D$ and $E$ only