The citation supporting part A is "Big-brained animals almost certainly wouldn't want to spend years lugging polyester-skinned mammals across shallow swimming pools six days a week," as shown in option A.
Support sentences are very important for the effectiveness of a text, as they allow a statement to be better understood, through examples, data, and evidence that extend the meaning and make it more palatable to the reader.
Part A to which the question refers shows that emotionally intelligent animals behave the same as humans in degrading situations.
Learn more about textual evidence at the link below:
https://brainly.com/question/375033