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A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let $O$ be the pole of the mirror and $C$ its centre of curvature. A point object is placed at $C$. It has a real image, also located at $C$. If the mirror is now filled with water, the image will be

• A
  (a) Real, and will remain at $C$
• B
  (b) Real, and located at a point between $C$ and $\infty$
• C
  (c) Virtual and located at a point between $C$ and $O$
• ✓
  (d) Real, and located at a point between $C$ and $O$