My question was deleted because it was "incomplete", but I'll answer again.
Simple
This sentence is simple because it contains one singular idea. It may be incorrectly identified as compound because the subject is compound (Forest rangers and volunteers). This is an easy mistake.
Hope this helps!! Good luck, mate. :)
Hm not sure since I don’t see the choices ;_;
Inferring is when a person concludes information by reasoning instead of actual said facts. When a person predicts something, he/she is trying to foretell what is going to happen in the future.