Consider the following statements and choose the correct option from the codes given below:
$I.$ Loading of phloem is related to the increase of sugar in phloem.
$II.$ Active loading of sugar in the sieve tube of phloem is driven by a proton pump.
$III.$ Pressure may be positive or negative in sieve tube cells.
$IV.$ Water and solutes move through the sieve tube against the pressure gradient.
$V.$ Cytoplasmic strands pass through the holes in sieve plates and form continuous filaments.

• A
  $I, II, V$ are incorrect,while $III$ and $IV$ are correct.
• B
  $III$ and $IV$ are incorrect while $I, II$ and $V$ are correct.
• C
  $I, II$ and $III$ are incorrect while $IV$ and $V$ are correct.
• D
  $IV$ and $V$ are incorrect while $I, II$ and $III$ are correct.