Which of these is a protectant fungicide?

Answer: Option C

Bordeaux mixture and Sulphur is a protectant fungicide.
Bordeaux mixture- a combination of copper sulfate, lime, and water- is an effective fungicide and bactericide that has been used for decades to control diseases of fruit and nut trees, vine fruits, and ornamental plants.
Sulphur 80% WDG is a non-systemic fungicide that works through contact and vapor action. It's a fungicide with preventive, curative and eradicative action on various crop pathogens.