Many weight-loss programs advertise that they can help individuals lose a great deal of weight without any changes in the individual's lifestyle. Typically when the person who has lost the weight leaves the program, he or she regains all the lost weight. This yo-yoing is almost as bad for the body as the excess weight. These weight-loss programs are engaged in _____ behavior.
a.legal and irresponsible
b.legal and responsible
c.illegal but responsible
d.legal but irresponsible