A.I. Explanation:

Option 1: "They eat more stem matter than zebras do."

Explanation: The text does not provide any information comparing the specific types of food consumed by wildebeests and zebras. Therefore, this statement cannot be confirmed as true.

Option 2: "They are able to digest large food particles if the food is of a high quality."

Explanation: The passage does not mention the wildebeests' ability to digest large food particles or their relationship with food quality. This makes the statement unsupported by the text.

Option 3: "They tend to choose feeding areas in which the vegetation has been worn down."

Explanation: This option is correct because the text indicates that wildebeests are choosier feeders and depend on the alterations made by zebras to the vegetation. This implies that they prefer areas where the vegetation has been modified, aligning with the idea of choosing worn-down feeding areas.

Option 4: "They are likely to choose low-quality food to eat in periods when the quantity of rainfall is low."

Explanation: The text does not support this statement. It suggests that wildebeests are choosier and would not likely opt for low-quality food, especially when rainfall is low.

Option 5: "They are relatively choosier than larger herbivores."

Explanation: This option is correct as the text describes wildebeests as 'choosier' compared to larger herbivores like zebras, which are less fastidious feeders. This directly supports the idea that wildebeests are more selective in their feeding habits.