Adapted passage context: The passage contrasts summer vacations of the past with highly scheduled present-day breaks. Today many children attend classes, camps and intensive trips. Earlier, summer often meant returning to the family's native place, spending time with extended family and strengthening a sense of belonging. The writer feels modern life is more attached to work and material identity. In the sentence 'It seems such a long break disrupts their development', the clause 'such a long break disrupts their development' is a:

1. Adverb clause
2. Noun clause
3. Principal clause
4. Adjective clause