The sentence below has been divided into three parts. Select the part of the sentence that has an error. If the sentence has no error, select the option 'No Error'.
Only after such preparatory measures- if / necessarily spreading over a period of many years- will public / attention and public resolution be fully aroused.
1
Only after such preparatory measures-if
2
No Error
3
attention and public resolution be fully aroused.
4
necessarily spreading over a period of many years- will public