Answer :
The main reason why it is important for a writer to include evidence for a claim made in a speech is that A. It gives the speech credibility.
What is a Claim?
This refers to the statement or assertion that is made about a particular thing that may or may not be true.
Hence, because a claim is not valid and is only just a given statement, it is important to make use of supporting details to give the speech or text some credibility.
Read more about claims here:
https://brainly.com/question/17494279
#SPJ5