Correct option is D
 The correct option to fill in the blank is (d) cast.
  
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  Cast means to throw or get rid of something. (फेंकना, त्यागना)
  
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  Example: He cast away his doubts and faced the challenge.
  
  
  Why other options are incorrect: 
  
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  Coast: The land along the sea (समुद्र तट)
  
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  Cost: The price or expense of something (लागत)
  
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  Caste: A social class or division (जाति)