Maria is studying the effects of calcium on the development of children, she administers different levels of calcium to two groups of children, one group consisting of children aged 5 and the other group consisting of children aged 10. She studies the growth rate of these two groups regularly over a period of one yea. Based on the given evidence, it would be most accurate to say that Maria is using-research

A-Conceptual
B-Sequential
C-Field-setting
D-Cross-sectional

D- Cross-sectional

D- Cross-sectional research

To determine the type of research Maria is conducting, we need to analyze the given information.

Maria is studying the effects of calcium on the development of children by administering different levels of calcium to two groups of children: one group consists of children aged 5, and the other group consists of children aged 10. She then studies the growth rate of these two groups regularly over a period of one year.

Based on this information, we can conclude that Maria is using a research method that involves studying and comparing different age groups over time. This type of research is known as cross-sectional research.

Cross-sectional research involves collecting data at a single point in time from different groups of people who differ in age, or other important variables. In this case, Maria is comparing children aged 5 to children aged 10 to determine the effects of calcium on their development.

Therefore, the most accurate answer is D- Cross-sectional research.