Select the correct option with respect to the given age pyramids.

• A
  $a$ - Expanding,$b$ - Stable,$c$ - Declining
• B
  $a$ - Stable,$b$ - Expanding,$c$ - Declining
• C
  $a$ - Stable,$b$ - Declining,$c$ - Expanding
• D
  $a$ - Declining,$b$ - Stable,$c$ - Expanding