Final answer:
The Nepalese government's strategy for limiting expeditions to Everest was by imposing higher permit fees, rather than restricting climbers by country, using a lottery system, or enacting a total ban. The correct option is b.
Step-by-step explanation:
The Nepalese government's plan for limiting the number of expeditions to Mount Everest did not include restricting the number of climbers from each country, implementing a lottery system for climbing permits, or banning climbing entirely.
Instead, the government opted for imposing higher permit fees as a strategy to reduce the number of climbers. This approach is similar to what the Kingdom of Bhutan has done to protect its environment by placing major restrictions on tourism.
Hence, Option b is correct.