Q:Write a multi-choice question for the following article, with the given choices and answer: Article: Imagine yourself halfway across the world in the beautiful hills of South Africa surrounded by the smiling faces of African children.Each day you wake to the sounds of laughing children.This place is Botshabelo, "place of refuge".However, these children were not always laughing, happy or safe.Nearly all of these children have been abused or ignored.Many are HIV positive and all have lost some or all of their family to AIDS.Here at Botshabelo, they are safe from hunger, cold, illness, poverty, hopelessness and fear. These children may live in Africa, but like all children they belong to the world.Through volunteering at the Children's Village, our global student ambassadors will experience themselves in a larger context of life, gain an expanded world view, build confidence and develop understanding of the balance between all living creatures. EXPERIENCES: Our global group will volunteer for two weeks at a Children's Village. Here we will take care of 150 children.The days are always full and never dull.We will volunteer at a lion reserve later, where we will help care for baby lions.We will also spend one day at another reserve taking in the beauty of the African landscape and hoping to catch sight of giraffes, zebras and the African elephants. WHO: Students aged 16 and above are invited to participate as our valued Student Ambassadors.A working knowledge of the English language is required.Adults are invited and needed to participate in the program as Adult Mentors, who will lend your unique skills and support throughout the program.We can promise you all an unforgettable, life-changing journey! WHEN: July 24, 2012 to August 7, 2012 COST: $ 1, 750 plus the cost of airfare Options: A To encourage people to help those sick children. B To encourage people to join a volunteer program. C To advise people to join a travel program to Africa. D To advice people to spend more time with children. Answer: B To encourage people to join a volunteer program. Question:
A:
What is the author's purpose of writing this text?