Which event directly led to beginning of world war z

Although the origin of the zombie pandemic is unknown, the story begins in China after an unknown creature bites a young boy (who becomes the official Patient Zero). The Chinese government attempts to contain the infection and concocts a crisis involving Taiwan to mask their activities.

FYI: I am talking about the movie

can you give a picture of the map, i'll be able to update my answer!

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.