using a list of SOURCES is the best way to speed up the research on the project
These will strengthen your argument. evidence from unbiased (aka, unopiniated and objective) and reliable (credible, believable) sources definitely gives you more to back up what you're saying.
If the passage is about the human errors that contributed to the spread of the fire, only details that prevented the firemen from being able to contain the fire should be used. The sentence "Even after the fire, Brown was confident..." shows that Brown was confident in his decision. This sentence does not however directly contribute to the firefighters inability to effectively contain the fire at the time of the fire. This takes place after the fire has done the damage.
Answer: The last one.
Explanation: When multiple items are listed, a comma is needed to separate them. The last sentence should be rewritten: Chad brought a tent, a sleeping bag, and a fishing rod.