According to paragraph 4, why did Hubbell and Johnson begin their study by mapping all the potential nest sites? A. To determine whether the availability of potential nest sites played a role in the distribution of bee colonies B. To know exactly where in the study area the colonies of all the different bee species were located C. To be sure that suitable nesting sites were equally available in all parts of study area D. To find out whether different species of bees preferred different types of trees as potential nest sites