Protists are:
$1.$ Unicellular and prokaryote
$2.$ Unicellular and eukaryote
$3.$ Multicellular and eukaryote
$4.$ Autotroph and heterotroph

• A
  $1 + 2 + 3$
• B
  $2 + 3 + 4$
• C
  $3 + 4$
• D
  $2 + 4$