The correct option is
B Cyprinus carpioA. Cirrhinus mrigala, known as Mrigal carp or White carp, is a ray finned fish and is native to India.
B. Cyprinus carpio is known as the common carp or European carp. It is a freshwater fish and native to Europe and Asia.
C. Labeo bata is commonly known as Bata fish and is native to Bangladesh and India.
D. Barbus stigma is commonly known as Barbel fish. It is a freshwater fish and native to India.
Hence, an exotic carp is the European carp or Cyprinus carpio.
So, the correct answer is 'Cyprinus carpio'.