Using the Abstract Information Provided Below,identify Which Group Would Be

Using the abstract information provided below,identify which group would be considered the "control group" for this experimental study.
"To determine the efficacy of a cognitive-behavioral intervention for treating insomnia in breast cancer survivors,randomized controlled trials were conducted with seventy-two women who through sleep diaries were identified as experiencing insomnia.Participants were randomly assigned to a multi-component intervention including stimulus control instructions,sleep restriction,and sleep or a single-component group (sleep education) ."

A) The group receiving the multi-component.
B) The group receiving the single component.
C) The group experiencing adverse effects.
D) The group refusing to participate.