Final answer:
In an argument, the two essential components are evidence and conclusion.
Step-by-step explanation:
The two essential components of an argument are evidence and conclusion. The evidence is the information or facts that support the conclusion, while the conclusion is the main point or claim that the arguer wants people to believe. For example, in the argument 'Since Jori is allergic to cats and her apartment complex does not allow dogs, it must be the case that Jori does not have a pet,' the premises are 'Jori is allergic to cats' and 'her apartment complex does not allow dogs,' and the conclusion is 'Jori does not have a pet.' Therefore, the correct answer is a. Evidence and conclusion.