Which of the following could best account for the discrepancy noted above? A. During periods of little rainfall, Koluga gorillas often wander down into the plains in search of food. B. Dormant strains of the simian virus are often difficult to detect. C. Due to the Morgania gorilla's natural habitat and its less reclusive nature, researchers have tested a greater number of Koluga gorillas than Morgania gorillas. D. Infected Koluga gorillas behave very aggressively and are more difficult to subdue for testing. E. The Koluga and the Morgania both have similar markings on their backs but are classified as different subspecies.