Statements A, B, C and D correctly distinguish different types of longitudinal surveys and their purpose of tracking change. Trend studies follow a population over time through different samples, cohort studies track a defined cohort and panel studies repeatedly survey the same individuals; all can reveal changes. Statement E is false because longitudinal surveys can indeed show both change and stability in attitudes or behaviours. Thus, the combination including A, B, C and D and excluding E is correct.
Option A:
Option A is incomplete because it omits D, the explicit recognition that longitudinal surveys provide information about change over time. Without D, the description of their main analytic value is less clear.
Option B:
Option B is wrong because it leaves out A, thereby failing to describe trend studies, which are a major type of longitudinal design. The omission prevents the option from covering all main variants.
Option C:
Option C is correct because it summarises all the true statements about trend, cohort and panel designs and about their capacity to track changes. It rejects E, which wrongly denies the possibility of assessing stability.
Option D:
Option D is incorrect as it includes E, the statement that denies insights into stability, and omits B, leaving out the cohort design. This combination therefore mixes a false statement with an incomplete set of true ones.
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