I'm taking a test and have to guess the right answer to the question after the article. Article: Classes resumed Thursday for the students of a school in Newtown, Conn, where a gunman last month killed 20 children and 6 adults in the second-largest school shooting in U.S. history. With their school still being treated as a crime scene, more than 400 students of Sandy Hook Primary School attended classes in neighbouring Monroe. Returning students, teachers and administrators were met by a large police presence outside their new school. Several officers guarded the entrance and checked IDs of parents dropping off children. Law-enforcement officers guarding the new school called it "the safest school in America." Students found the same chairs and desks, when possible. Their classroom walls were painted the same colours and hung with the same pictures. Other details, such as the location of bookshelves and cubby holes, were replicated as much as possible. The school district said parents who wanted to be close to their children were welcome to visit and stay in classrooms or an auditorium. Newtown superintendent Janet Robinson said officials would do their best to make the students feel at ease. "We will be doing a normal day." She said. Question: The students of Sandy Hook Elementary School resumed classes in a new school in Monroe because _ . Options: A: their school fell down because of a natural disaster B: the government needs to use the land of their school C: their school is too small to hold more than 400 students D: a shooting crime happened in their school and it was still treated as a crime scene
The answer to this question is:
D