The correct option is D Dogs are less intelligent than many people believe
Both the author of the passage 1 and the experts mentioned in passage 2 hold the belief that dogs are less intelligent than many people believe. In passage 1 it has been claimed that scientists believe the intelligence of chimps to be greater than that of dogs and that the belief that dogs are more intelligent is only due to the emotional ties that humans have with them. In passage 2 as per the experts, the dogs do not have any real reasoning abilities, unlike chimpanzees who do have such abilities and it has been said that dogs learn to avoid the unpleasant and they don't think. So, the correct option is 'Dogs are less intelligent than many people believe'.