Explanation:

- Miss the boat typically means to miss an opportunity. This idiom suggests that someone has not taken advantage of a chance or offer, much like missing an actual boat leaves one stranded.

- Correct Answer: Miss an opportunity

- Miss the goal of life involves a broader philosophical perspective where one fails to achieve what might be considered the ultimate objectives or purposes of existence.

- Miss the person generally refers to failing to connect with or being unable to interact with someone, usually due to timing or circumstances.

- Miss the journey would imply not being part of a trip or adventure. It's about not experiencing the path or process of getting somewhere.