During the First Few Days of Masters and Johnson's Sex

During the first few days of Masters and Johnson's sex therapy,

A) couples are instructed to have sex as often as possible and to practice the techniques they are being taught.
B) couples are instructed not to make any changes in their sexual relationship until the assessment period is over.
C) couples are instructed not to engage in any sexual activity.
D) instructions about sexual activities vary depending on the particular dysfunction being treated.