Come up with a question and reasoning that would justify this answer: it is not possible to tell
The question is: Given the sentence "A toddler sitting in a portable highchair enjoys a snack on the grass as his mother and possibly his older brother look on." is it true that "Someone is eating a snack."?
Step-by-step reasoning process: Perhaps the toddler is enjoying merely playing with his snack instead of being in the act of eating it.