What must a crab cross to reach the ocean?
Options:
- lakes
- shore line
- shallow waters
- tidepools
- atlantic ocean
Step-by-step reasoning process below:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Shoreline is the line along which a large body of water meets the land. A crab must cross shoreline to reach the ocean. The answer: shore line.