The correct answer is B.

• Space Application Center, SAC located in Ahmedabad, Gujarat, India.
• The Space Applications Centre is an institution of research in Ahmedabad under the aegis of the Indian Space Research Organisation.
• Indian Space Research Organization is founded by Dr.Vikram Sarabhai.
• Indians Space Research Organization's current chairman is Dr.K Sivan.

• Space Applications Centre (SAC) is one of the major centers of the Indian Space Research Organisation (ISRO).
• SAC focuses on the design of space-borne instruments for ISRO missions and the development and operationalization of applications of space technology for societal benefits.

• The Indian Space Research Organisation or is the national space agency of the Republic of India, headquartered in Bengaluru.
• It operates under Department of Space which is directly overseen by the prime minister of India while chairman of ISRO acts as executive of DOS as well. 

• Top 5 Spacer agencies in the world are:
  • ​National Aeronautics and Space Administration (NASA).
  • China National Space Administration (CNSA).
  • European Space Agency (ESA).
  • Russian Federal Space Agency (Roscosmos).
  • Indian Space Research Organisation (ISRO).