Based on the description of the map provided, areas shaded red indicate locations where malaria is prevalent everywhere, while yellow indicates isolated risks, and green areas have no known malaria.
Sub-Saharan Africa is known to have a high prevalence of malaria, often shaded red on similar maps. According to this understanding:
B. There is a significant chance of catching malaria in sub-Saharan Africa.
is the best answer from the choices provided, as it reflects the known risk levels for malaria in that region.