The two correct answers that best support the inference that honeybees, not bumblebees, are responsible for infecting the studied flowers are:
- All of the honeybees researchers collected were infected with both viruses.
- More bumblebees foraging close to apiaries had viruses on their outsides than had active infections.
These statements indicate a stronger correlation between honeybees and the viruses, helping to imply that honeybees are the primary vector for infection in the studied flowers.