Lorenzo is conducting a research study to understand the correlation between the incidence of breast cancer and the age among women. The women in the research study are from the same ethnic background and belong to the upper middle class. Lorenzo selects 30 women for the study and then divides them into three groups based on their age. The first group consists of women aged 25-35, the second group consists of women aged 36-50, and the third group consists of women aged 51-65. Which of the following is likely to be a limitation in Lorenzo's method of research?
A. The results are likely to reflect cohort differences.
B. It is likely to be time-consuming.
C. The participants are likely to drop out of the research.
D. It is likely to require taking multiple observations.
Answer: A
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