$I.$ Bacteriophages are $...A...$ infecting $...B....$
$II. ...C...$ are hybrid vectors derived from plasmids which contain $cos$ site of $\lambda$ phage.
$A, B$ and $C$ in above statements refer to:

• A
  $A-$Protozoa,$B-$Bacteria,$C-$Cosmid
• B
  $A-$Plasmid,$B-$Virus,$C-$Cosmid
• C
  $A-$Bacteria,$B-$Virus,$C-$Cosmid
• D
  $A-$Virus,$B-$Bacteria,$C-$Cosmid