What is the purpose of evidence in an argument? to state the writer's main point and what he or she wants to accomplish
to support the author's reasons for his or her claim
to identify how the author's reasons relate to the claim
to appeal to the audience's emotions, logic, and ethics

to state the writers main point and what he or she wants to accomplish

"to support the author's reasons for his or her claim"

Explanation:

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the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.