The correct answer is A) FSSAI (Food Safety and Standards Authority of India).
The FSSAI is a statutory body established under the Food Safety and Standards Act, 2006. It is responsible for laying down science-based standards for food safety, regulating food safety, and enforcing food safety laws in India.
Agmark is a quality assurance and grading system for agricultural produce in India. It is administered by the Agricultural Marketing Service (AMS) of the Ministry of Agriculture and Farmers Welfare.
APEDA is a statutory body established under the Agricultural and Processed Food Products Export Development Authority Act, 1985. It is responsible for promoting the export of agricultural and processed food products from India.
BIS is a national standards body of India. It is responsible for developing and publishing standards for goods and services, and for testing and certification of products and systems.
The FSSAI is the most appropriate organization to regulate food safety standards in Telangana because it is the only organization that has been specifically tasked with this responsibility by the government of India. The other organizations mentioned in the question do not have the same mandate or expertise in food safety.