Correct Answer: (b) there was collusion between objectors, due to similarities
Solution:The word 'collusion" means "secret agreement or cooperation especially for an illegal or harmful purpose."In this case, the objectors are cooperating with each other to send similar letters to the council.
The word "between" is used to indicate that the collusion is between two or more parties.
- Hence, 'there was collusion between objectors, due to similarities' is the most appropriate answer.