Identify the correct research method and explain why it is. does touch affect the physical growth of children?

case study
correlationional study
experimental study
naturalistic observation
survey

I think 3 or 4 but 4 is my answer

Explanation:

 baby's first experience with the surrounding environment occurs through touch, developing prenatally as early as 16 weeks. This sense is essential to children's growth of physical abilities, language and cognitive skills, and social-emotional competency.

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.