The correct option is
A Sandfly, deer fly, tse-tse fly and housefly
Vector host is an agent that transmits the pathogens of infectious disease from one living organism to another and may be a person, animal or microorganism. While the
Anopheles mosquito is the vector for malarial parasites, sandfly is a vector for leishmaniasis, tsetse fly are vectors of trypanosomes that causes trypanosomiasis or sleeping sickness. Houseflies on the other hand are vector for nearly 100 pathogens that causes, typhoid, cholera, salmonellosis, tuberculosis, anthrax etc., eer flies which belong to the genus
Chrysops are vectors for pathogens that causes diseases such as anthrax, tularemia and loa loa filariasis.
Therefore, the correct answer is option A.