Given below are four jumbled sentences. . Pick the option that gives their correct order.
A. Having cancer is often one of the most stressful experiences in a person's life. 
B. They also allow people to learn from others facing similar situations .
C. The groups are gaining popularity these days as they allow volunteers to talk with those who are living with cancer.
D. But these days there are support groups that help patients cope with the emotional aspects of cancer by providing an opportunity to share feelings and challenges they face with others.