Option A is incorrect. Riya was full of sorrow and did not suffer a heart attack. Thus, it is incorrect.
Option B is correct. 'Very sad' means 'full of sorrow'. Thus, it has the required meaning and is the correct option.
Option C is incorrect. Riya did not have heartache and thus, it is the incorrect option.
Option D is incorrect. Riya did not break away, she was sad. Thus, it cannot be the answer.