Statement $S$: Presence of a rigid cell wall and nucleoprotein as genetic material. Statement $R$: Examples include Euglena,Dinoflagellates,Amoeba,and Paramecium.

• A
  Statement $S$ is true and statement $R$ is false.
• B
  Statement $S$ is false and statement $R$ is true.
• C
  Both statements $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
• D
  Both statements $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.