The size of the tail of a typical bacteriophage is:

• A
  $1000 \times 200\, \mathring{A}$
• B
  $1000 \times 250\, \mathring{A}$
• C
  $1000 \times 230\, \mathring{A}$
• D
  $1000 \times 300\, \mathring{A}$