Answer: The correct answer is: There is no relationship between children's homelessness and a lenght of hospital stay, verbal skills, and fear of separation from parents.
Explanation: A research hypothesis is a tentative statement about the relationship between two ore more variables. It is a specific prediction that the researcher wants to test in a particular study.
In this case, the only statement that follows the structure of a research hypothesis is the first one, the other two statements seem to be conclusive statements, but not really tentative statements.