Question: Large populations of tortoises inhabited the Galapagos Islands before humans. When humans settled on the islands and introduced goats, the number of tortoise declined. What is most likely the explanation for the decrease in the tortoise population?

  Options: 
 A. Goats consume tortoise hatchlings.
 B. Goats pollute water sources.
 C. Goats compete with tortoises for vegetation.
 D. Goats contribute to soil erosion.
Answer: C