Jacob brings his three-year-old daughter in for a research study on how children from age 3 to 5 develop understanding of numbers. he is told that his child will either be assigned to an experimental or control group and that he will need to bring her back to the lab every six months for the next two years. which type of study is jacob's daughter participating in? a) correlationalb) cross-sectionalc) descriptived) longitudinal

D) Longitudinal

Explanation:

longitudinal study -

It is a research design which involve the repeated observations of the same variables , over long or short period of time .      

This study is used for clinical psychology , social-personality , in order to study the rapid fluctuations in the emotions ,  thoughts , behaviors in the day - to - day activities .

Hence from the question , the correct answer is D) Longitudinal .

not really sure sorry just trying to get points