Step 1: Recall what Kingdom Protista actually holds.
Protista is the home for all unicellular eukaryotes that do not fit neatly into plants, animals or fungi, so it covers photosynthetic, animal like and fungus like single celled forms together.
Step 2: Check statement A against this definition.
Euglena is a euglenoid, Plasmodium is a sporozoan protozoan, and Amoeba is an amoeboid protozoan, all three are single celled eukaryotes, so they belong in Protista and statement A holds true.
Step 3: Test the other statements quickly.
Cyanobacteria are prokaryotes with a primitive photosynthetic system, not advanced, bacteriophages carry only one type of nucleic acid at a time, never both DNA and RNA together, and fungal cell walls are made of chitin, not glycogen which is an animal storage molecule. All three fail.
Final answer: Option 1, only the statement about Protista holding Euglena, Plasmodium and Amoeba is correct.