Final answer:
Launcelot could either use the knowledge strategically, keep it to himself, or seek guidance from others on how to utilize it.
Step-by-step explanation:
Based on the provided information, it is difficult to determine exactly what Launcelot will do with the newly acquired knowledge. However, we can make an educated guess based on the principles mentioned.
Option A) Use it to his advantage in a strategic plan or decision: This could be a possibility as the text mentions the need to make the best use of resources and to lay plans well ahead.
Option C) Keep it to himself, maintaining a discreet and cautious approach: This option is also plausible as the text suggests the importance of secrecy, deception, and altering plans to keep the enemy without definite knowledge.
Option E) Seek guidance from others on how to best utilize the knowledge: This option cannot be ruled out as the text emphasizes the need for local guides and the importance of cultivating resources.
Without further context, it is impossible to determine a definitive answer, but based on the principles mentioned, options A, C, and E are the most likely choices.