True or "Classical" Experiments Differ from Quasi­experiments with Respect to the Fact

True or "classical" experiments differ from quasi­experiments 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