Vultures which used to be very common in Indian country side some years ago are rarely seen nowadays. This is attributed to-

[ A ]    The destruction of their nesting sites by new invasive species
[ B ]    A drug used by cattle owners for treating their diseased cattle
[ C ]    Scarcity of food available to them
[ D ]    A widespread, persistent and fatal disease among them
Answer : Option A
Explanation :

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