Match the following List-$I$ ($F^-$ ion concentration in drinking water) with List-$II$ (Effects on humans):

List-$I$	List-$II$
$(A)$ $< 1 \ ppm$	$(i)$ Harmful to bones
$(B)$ $> 2 \ ppm$	$(ii)$ Tooth decay
$(C)$ $> 10 \ ppm$	$(iii)$ Brown mottling of teeth

Then the correct match is:

• A
  $A - iii, B - ii, C - i$
• B
  $A - iii, B - i, C - ii$
• C
  $A - ii, B - i, C - iii$
• D
  $A - ii, B - iii, C - i$