Vultures, which were very common in our countryside a few years ago, are rarely seen nowadays. This is attributed to one of the Following :

Vultures, which were very common in our countryside a few years ago, are rarely seen nowadays. This is attributed to one of the Following : (a) 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 amongst them Answer (B)