A professor is studying the effects of different communication styles (Guiding vs. Directing) on physical activity behaviour reported during pregnancy. In the study, the professor compares minutes of physical activity reported by adults during Week 26 of pregnancy following random assignment to either 'directing' (n = 25) or 'guiding' (n = 25) instructions about exercise provided by a registered kinesiologist. What type of design has been used in this study?
A) Hermeneutical Phenomenology
B) Non-Experimental Design
C) Quasi-Experimental Design
D) Randomized Experimental Design
