Final answer:
DeLongis et al.'s study likely demonstrates strengths in its B)longitudinal design, large sample size, rigor in statistical testing, and clear presentation of findings which contribute to the robustness and generalizability of the results.
Step-by-step explanation:
The strengths of DeLongis et al.'s study likely revolve around its research design and methodology which may include a longitudinal study design, potentially providing a comprehensive analysis over time.
If the study features a large sample size, this could contribute to the robustness of the findings by reflecting a wide range of participants and enhancing the generalizability of the results.
Moreover, the study may also show strength through effective use of statistical tests and presentation of data that could lead to clear findings and conclusions.
However, without more specific details on DeLongis et al.'s study, it is difficult to pinpoint the exact strengths. In general, studies that utilize rigorous methodologies and provide data that is both clear in presentation and applicable in broader contexts are viewed favorably in the research community.