The potato spindle tuber disease is caused by which of the following?

The given figure shows some structures labelled as $A, B, C$ and $D$. Which structure has the protein coat that encloses the nucleic acid?

$A$ virus can be considered a living organism because it

Tobacco Mosaic Virus $(TMV)$ has:

Assertion $A$: Viroids and viruses can pass through bacteria-proof filters.
Reason $R$: Bacteria are retained by bacteria-proof filters.
Which option is correct for Assertion $A$ and Reason $R$?

Given below is the diagram of a bacteriophage. In which one of the options are all the four parts $A, B, C$ and $D$ correctly identified?