Definition: You are given a question on human aging. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: A researcher who is interested in the differences between two or more groups of people is most likely to use which of the following approaches?
(A)Quasi-experimental (B)Longitudinal (C)Correlational (D)Cross-sequential

A