Final answer:
The quote by Carr (1977) means that behavior can be seen as a type of non-verbal communication meant to express intent, aligning most closely with the idea that behavior itself is a method of conveying messages.
Step-by-step explanation:
The quote “All behavior has a communicative intent” (Carr, 1977) suggests that every behavior exhibited by an individual has a purpose of conveying some type of message or intent. It aligns with the idea that behavior is more than just a random act; it is a form of non-verbal communication. When considering the statements provided, the best explanation of this quote is that behavior is a form of communication that conveys intent.