________ Is a Type of Research Design Involving a Fixed

Multiple Choice

________ is a type of research design involving a fixed sample of population elements that is measured repeatedly.The sample remains the same over time thus providing a series of pictures which,when viewed together,portray a vivid illustration of the situation and the changes that are taking place over time.

A) Exploratory research design
B) Causal research design
C) Cross-sectional research design
D) Longitudinal research design