Please select the eligibility criteria that correspond to the clinical trial below.
Title: Development and Application of Appropriate Technology for Obesity Prevention and Control in Seven Centers in China
Brief Summary: The study was designed as a national multi-centered cluster randomized controlled trial involving more than 70,000 children and adolescents aged 7-18 years from 7 provinces in China. In each center, about 12-16 primary and secondary schools, with totally at least 10000 participants were randomly selected (Primary: Secondary=1:1). All of the selected schools were randomly allocated to either intervention or control group (Intervention: Control=1:1).The multi-components school-based and family-involved scheme was conducted within the intervention group for 9 month, while students in the control group followed their usual health practice. The intervention consisted of four components: a) Create supportive school and family environment, b) Health lifestyles education and related compulsory physical activities, c) Instruct and promote school physical education, d) Self-monitor obesity related behaviors. Four types of outcomes including anthropometric, behavioral, blood chemical and physical fitness were measured to assess the effectiveness of the intervention program.


Options:
A: Inclusion Criteria:

* Schools must have at least one full classrooms for the 3rd year of preschool.
* The approval of boards of governors will be necessary to participate in the intervention and in the measurements at the beginning and end of academic year.
* Children's parents or legal representatives will sign an informed consent to participate.
* Children's parents will be invited to collaborate by filling in questionnaires with regard to family leisure habits, sleeping, eating and getting around town.

Exclusion Criteria:

* Children with severe Spanish language learning difficulties.
* Children with serious physical or mental disorders identified by parents or teachers that would impede participation in the programme's activities
* Children diagnoses of chronic disorders, such as heart disease, diabetes or asthma, which in the opinion of their paediatricians would prevent their participation in the programme's activities (MOVI-da10!).
B: Inclusion Criteria:

* All included within the classes, population based cohort

Exclusion Criteria:

* None
C: Inclusion Criteria:

grade of 1 to 5 in primary schools and grade of 6 to 8 and 10 to 11 in secondary schools.

Exclusion Criteria:

Suffering or any history of disabilities, cardiovascular diseases, asthma, metabolic diseases, etc.
D: 1. Eligibility criteria for schools The trial recruited a total of 24 schools. A convenience sample of 8 schools were selected from Beijing, Shanxi (Changzhi City) and Xinjiang (Urumqi City) respectively.

1. Inclusion Criteria for schools:

   * school leader agreeing to implement this intervention; requiring school teachers who can implement this intervention (e.g. school doctors, physical education teachers, physical education teachers, etc.); having at least 50 children from Grade 4 (at the start of the intervention) per school;having a even number of schools within each district.
2. Exclusion Criteria for schools:

   * boarding schools;schools solely for children with special skills; schools of minor ethnic groups; similar programme (focus on weight gain prevention) would be conducted in schools during the study period; schools having a cancelling or relocation plan during the study period.

     2. Eligibility criteria for classes One class per school will be selected if the estimated number of students enrolled in the programme is no less than 40 within the selected class; two classes per school will be selected if the estimated number of students enrolled in the programme is less than 40 within the selected class.

     3. Eligibility criteria for students Eligible children will be those whose primary caregivers will provide written consent to participate the study. After collecting students' medical history from their parents, we will exclude individuals suffering from or having a history of any cardiovascular and metabolic diseases, asthma and disabilities that limit their ability to perform physical activity.

Answer: C