be going to 表示将来计划 — 英语选择题

Mia计划下周一参观新学校。哪句话用 be going to 表示她的计划？ A. She is going to visit her new school next Monday. B. She going to visit her new school next Monday. C. She is go to visit her new school next Monday. D. She is going visit her new school next Monday.