I'm thinking maybe C, but then, it could be one of the others too...

"A team of scientists visits an island in the Caribbean Sea. They find a diverse community of turtles, lizards, birds, and a variety of trees, shrubs, and grasses. No humans live on the island.

Several years later, the scientists return to the island. They find a much smaller community, with reduced populations of all of the species they had identified earlier. Some of the animals now appear to be absent from the island.

Which is the most likely explanation for the changes that the scientists observed?

A. Competition for resources caused all of the island populations to decrease at the same time.
B. A disease or parasite affected all of the island populations.
C. A natural disaster, such as a hurricane, struck the island.
D. Stress from overcrowding affected all of the island populations."