Answer: Answer: correlational research method.
This is because it can be used to compare the relationship between two variables, in this subject the two variables are "poor prenatal nutrition and early cognitive development"
Step-by-step explanation:
correlational research method is a research method that involves comparing the relationship involving two variables during a particular research study. This method uses statistics to assess, interpret and gain understanding between two variables without any influence from unrelated variable(s).
A correlational research can either be positive or negative or of no correlation.
Correlational research helps researcher to do away with errors or mistake, it can be used to predict likely future occurrence through a current data