根据下列材料，请回答下列各题 The League of High Schools is pleased to invite student freethinkers to our 2007 Student Leadership Meeting July 15—17 at our office building in Manhattan，New York． This yearly meeting has been successfully held for the past three years．The event brings together student activists from around North America for a busy weekend of workshops，networking lectures，and a lot of fun． We encourage every school to send at least one representative(代表)(if not more)and We are keeping the costs down to help make this possible．Any individual(个人)student activists who are interested are also welcome to attend．Registration(注册)，room and food for the entire three-day event will cost only$39 for each student．We’ve booked you single rooms at Travelodge．New York．For any information about the hotel，please call 88643911． This time we are making a special offer--providing some money for traveling to make sure each group can send a representative even if it lacks the money to do so．Email Anna Porter at [e-mail] or call 46935040 to get more information about this travel support． The registration form. can be found at http：／／www．Freethought.org／SLM2007.pdf．For more information about registration you may call Lucy Becker at 36904560 or email her at Ibecker@leaguehighschool net. So don’t wait! Send in your registration． What is the main purpose of this text？

A. To introduce meeting organizers．
B. To call for papers for a meeting．
C. To invite students to a meeting．
D. To explain meeting programs．