Two scientists are observing a group of children eating at snack time. After watching the children, Scientist A says the children eat because they are hungry. Scientist B says the children eat because their friends are eating. Which scientist's conclusion is valid? A. Scientist B's conclusion is valid because it is supported by evidence. B. Neither conclusion is valid. Conclusions cannot be drawn from observations. C. Scientist A's conclusion is valid because eating is necessary to stay healthy. D. Both scientists' conclusions could be valid.