How can you tell if the nonfiction you are reading contains opinion?

1: headings will indicate any use of opinion

2: only fiction makes use of opinion in writing

3: there will be signal words and phrases

4: it is best to write to the author to find out

Read the sentence from the war of the worlds. i turned, and as i did so the screw must have come out, for the lid of the cylinder fell upon the gravel with a ringing concussion. which option is the accurate synonym of the word concussion as it is used in the sentence? explosion disruption crash interruption