Answer: The last option, "Para comenzar"
Explanation:
Para comenzar means to start, which is not how you end a conversation. The other three remaining options are used to finalize an idea or summary. To be more specific, I'll translate below.
-Por último: Lastly
-Para concluír: To conclude
-Para resumir: To resume
-Para comenzar: To start
With that being said, the only one that does not have to do with finishing is the last option, "para comenzar".
My native language is Spanish so I hope this helps! Pls mark brainliest!! :)