The correct answer is - Steve Donohue believes that rain barrels are easy to install and use.
When it comes to being objective, it means that you shouldn't write about your own biased feelings and opinions about a particular subject. Sentences A, C, and D are clearly subjective - by using words and phrases such as 'I'm not convinced,' 'unattractive and clunky,' and 'selfishly,' you are clearly stating your own opinion, thus not being objective.