Which of the following is a strategy used for a true-experimental design?

A) Assigning participants to groups based on age
B) manipulating the dependent variable
C) exploring cause and effect of relationships
D) All of the above are correct

True-Experimental Design

True-experimental design is a type of experimental research methodology that involves the manipulation of variables, control of extraneous variables through random assignment, and the comparison between a control group and one or more experimental groups to determine causal relationships.

Cause and Effect

A relationship between two events where one event (the cause) directly results in the other event (the effect).