Final answer:
The correct answer to the question, recalling a 'PERILOUS journey', is D. hazardous, as 'perilous' signifies a situation that is full of danger or risk.
Step-by-step explanation:
The word perilous in the sentence "We will long remember our PERILOUS journey" means fraught with danger or hazardous. None of the other options provided, such as 'lengthy', 'primitive', or 'chaotic' accurately fits the context of danger that 'perilous' implies. Therefore, the correct option is D. hazardous.
When referring to something as perilous, it suggests that there is a significant level of risk involved that could potentially lead to harm or injury. The use of this word indicates that the journey was not only difficult but also dangerous.