Final answer:
The correct answer is option c. Green. When passing through a lock, the green light typically means 'approach the lock under full control.'
Step-by-step explanation:
The correct answer is option c. Green.
When passing through a lock, the green light typically means "approach the lock under full control." The green light indicates that the lock is clear, and it is safe to proceed into the lock.
For example, in a navigation lock system on a canal or river, the green light is displayed when there are no obstructions in the lock chamber, and it is safe for a boat or ship to enter the lock. It is an important signal for vessels to approach the lock cautiously and maintain control throughout the process.
The correct answer is option b. Amber. When navigating waterways and coming across a lock system, different light signals are used to instruct the approaching vessel on how to proceed.
The amber light indicates that a vessel should approach the lock under full control. This means that the boat should be ready to maneuver and capable of stopping if necessary.
It does not indicate that the lock is ready for entry but advises the captain to be prepared for further instructions or to proceed with caution while awaiting the green light that grants permission to enter the lock.