Mission Possible C

Q: In this paragraph it states, "the balloon strikes an object that originally was at least 20 cm away from the balloon". Which part of the balloon has to be 20 cm away? Is it the closest point or where the reaction starts. (section: 4 / paragraph: b / sub-paragraph: i / line: 1)

A: All parts of the balloon must be at least 20cm away from that object at ready-to-run configuration.