True or "classical" experiments differ from quasi-experiments with respect to the fact that
a. classical experiments use random assignment to control and experimental groups while quasi-experimental designs do not
b. classical experiments use experimental groups while quasi-experimental designs use experimental and control groups
c. quasi-experimental designs afford more control than do classical designs
d. only one independent variable can be used in a classical experiment, while there are no limits to the number of independent variables in a quasi-experimental design
a
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